korlov42 commented on code in PR #6518:
URL: https://github.com/apache/ignite-3/pull/6518#discussion_r2314994130


##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();

Review Comment:
   ```suggestion
       @SuppressWarnings("UseOfObsoleteDateTimeApi")
       private static final Calendar CALENDAR = Calendar.getInstance();
   ```



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {

Review Comment:
   should we make it private?



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {
+        return createPositionedMulti(new ColumnDefinition[]{col}, new 
Object[]{value});
+    }
+
+    private ResultSet createPositionedMulti(@Nullable ZoneId zoneId, 
ColumnDefinition[] columns, Object[] values) throws SQLException {
+        if (columns.length != values.length) {
+            throw new IllegalArgumentException("cols, values must have the 
same length");
+        }
+
+        List<ColumnDefinition> cols = Arrays.asList(columns);
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(values));
+
+        ResultSet rs = createResultSet(zoneId, cols, rows);
+        assertTrue(rs.next());
+        return rs;
+    }
+
+    private ResultSet createPositionedMulti(ColumnDefinition[] columns, 
Object[] values) throws SQLException {
+        return createPositionedMulti(null, columns, values);
+    }
+
+    @Test
+    public void getNotSupportedTypes() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.getArray(1));
+            expectNotSupported(() -> rs.getArray("C"));
+
+            expectNotSupported(() -> rs.getAsciiStream(1));
+            expectNotSupported(() -> rs.getAsciiStream("C"));
+
+            expectNotSupported(() -> rs.getBinaryStream(1));
+            expectNotSupported(() -> rs.getBinaryStream("C"));
+
+            expectNotSupported(() -> rs.getBlob(1));
+            expectNotSupported(() -> rs.getBlob("C"));
+
+            expectNotSupported(() -> rs.getClob(1));
+            expectNotSupported(() -> rs.getClob("C"));
+
+            expectNotSupported(() -> rs.getCharacterStream(1));
+            expectNotSupported(() -> rs.getCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNCharacterStream(1));
+            expectNotSupported(() -> rs.getNCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNClob(1));
+            expectNotSupported(() -> rs.getNClob("C"));
+
+            expectNotSupported(() -> rs.getRef(1));
+            expectNotSupported(() -> rs.getRef("C"));
+
+            expectNotSupported(() -> rs.getRowId(1));
+            expectNotSupported(() -> rs.getRowId("C"));
+
+            expectNotSupported(() -> rs.getSQLXML(1));
+            expectNotSupported(() -> rs.getSQLXML("C"));
+
+            expectNotSupported(() -> rs.getObject(1, Map.of()));
+            expectNotSupported(() -> rs.getObject("C", Map.of()));
+        }
+    }
+
+    @Test
+    public void updateMethodsAreNotSupported() throws Exception {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.updateBoolean(1, true));
+            expectNotSupported(() -> rs.updateBoolean("C", true));
+
+            expectNotSupported(() -> rs.updateByte(1, (byte) 0));
+            expectNotSupported(() -> rs.updateByte("C", (byte) 0));
+
+            expectNotSupported(() -> rs.updateShort(1, (short) 0));
+            expectNotSupported(() -> rs.updateShort("C", (short) 0));
+
+            expectNotSupported(() -> rs.updateInt(1, 0));
+            expectNotSupported(() -> rs.updateInt("C", 0));
+
+            expectNotSupported(() -> rs.updateLong(1, 0));
+            expectNotSupported(() -> rs.updateLong("C", 0));
+
+            expectNotSupported(() -> rs.updateFloat(1, (float) 0.0));
+            expectNotSupported(() -> rs.updateFloat("C", (float) 0.0));
+
+            expectNotSupported(() -> rs.updateDouble(1, 0.0));
+            expectNotSupported(() -> rs.updateDouble("C", 0.0));
+
+            expectNotSupported(() -> rs.updateString(1, ""));
+            expectNotSupported(() -> rs.updateString("C", ""));
+
+            expectNotSupported(() -> rs.updateTime(1, new Time(0)));
+            expectNotSupported(() -> rs.updateTime("C", new Time(0)));
+
+            expectNotSupported(() -> rs.updateDate(1, new Date(0)));
+            expectNotSupported(() -> rs.updateDate("C", new Date(0)));
+
+            expectNotSupported(() -> rs.updateTimestamp(1, new Timestamp(0)));
+            expectNotSupported(() -> rs.updateTimestamp("C", new 
Timestamp(0)));
+
+            expectNotSupported(() -> rs.updateBytes(1, new byte[]{1}));
+            expectNotSupported(() -> rs.updateBytes("C", new byte[]{1}));
+
+            expectNotSupported(() -> rs.updateArray(1, null));
+            expectNotSupported(() -> rs.updateArray("C", null));
+
+            expectNotSupported(() -> rs.updateBlob(1, (Blob) null));
+            expectNotSupported(() -> rs.updateBlob(1, (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob(1, null, 0L));
+            expectNotSupported(() -> rs.updateBlob("C", (Blob) null));
+            expectNotSupported(() -> rs.updateBlob("C", (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateClob(1, (Clob) null));
+            expectNotSupported(() -> rs.updateClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateClob("C", (Clob) null));
+            expectNotSupported(() -> rs.updateClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNClob(1, (NClob) null));
+            expectNotSupported(() -> rs.updateNClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateNClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateNClob("C", (NClob) null));
+            expectNotSupported(() -> rs.updateNClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateNClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateAsciiStream(1, null));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateBinaryStream(1, null));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateRef(1, null));
+            expectNotSupported(() -> rs.updateRef("C", null));
+
+            expectNotSupported(() -> rs.updateRowId(1, null));
+            expectNotSupported(() -> rs.updateRowId("C", null));
+
+            expectNotSupported(() -> rs.updateNString(1, null));
+            expectNotSupported(() -> rs.updateNString("C", null));
+
+            expectNotSupported(() -> rs.updateSQLXML(1, null));
+            expectNotSupported(() -> rs.updateSQLXML("C", null));
+
+            expectNotSupported(() -> rs.updateObject(1, null));
+            expectNotSupported(() -> rs.updateObject(1, null, 0));
+            expectNotSupported(() -> rs.updateObject("C", null));
+            expectNotSupported(() -> rs.updateObject("C", null, 0));
+
+            expectNotSupported(() -> rs.updateBigDecimal(1, null));
+            expectNotSupported(() -> rs.updateBigDecimal("C", null));
+
+            expectNotSupported(() -> rs.updateNull(1));
+            expectNotSupported(() -> rs.updateNull("C"));
+
+            expectNotSupported(rs::cancelRowUpdates);
+
+            expectNotSupported(rs::updateRow);
+
+            expectNotSupported(rs::deleteRow);
+
+            expectNotSupported(rs::insertRow);
+
+            expectNotSupported(rs::moveToInsertRow);
+        }
+    }
+
+    @Test
+    public void navigationMethods() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            assertTrue(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertTrue(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(1, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertTrue(rs.isLast());
+            assertEquals(2, rs.getRow());
+
+            assertFalse(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertTrue(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+        }
+
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            String error = "Result set is forward-only.";
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            assertTrue(rs.next());
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            expectSqlException(() -> rs.absolute(0), error);
+            expectSqlException(() -> rs.relative(0), error);
+            expectSqlException(rs::previous, error);
+
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+            rs.setFetchDirection(ResultSet.FETCH_FORWARD);
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+
+            assertEquals(ResultSet.CONCUR_READ_ONLY, rs.getConcurrency());
+            assertEquals(ResultSet.TYPE_FORWARD_ONLY, rs.getType());
+            assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, 
rs.getHoldability());
+
+            expectSqlException(rs::moveToCurrentRow, "The result set 
concurrency is CONCUR_READ_ONLY");
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullPositional(ColumnType columnType) throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
columnType, 0, 0, false), null)) {
+            switch (columnType) {
+                case NULL:
+                    assertNull(rs.getObject(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BOOLEAN:
+                    assertFalse(rs.getBoolean(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT8:
+                    assertEquals(0, rs.getByte(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT16:
+                    assertEquals(0, rs.getShort(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT32:
+                    assertEquals(0, rs.getInt(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT64:
+                    assertEquals(0, rs.getLong(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case FLOAT:
+                    assertEquals(0, rs.getFloat(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DOUBLE:
+                    assertEquals(0, rs.getDouble(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DECIMAL:
+                    assertNull(rs.getBigDecimal(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATE:
+                    assertNull(rs.getDate(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIME:
+                    assertNull(rs.getTime(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATETIME:
+                    assertNull(rs.getTimestamp(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIMESTAMP:
+                    assertNull(rs.getTimestamp(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case UUID:
+                    assertNull(rs.getObject(1, UUID.class));
+                    assertTrue(rs.wasNull());
+                    break;
+                case STRING:
+                    assertNull(rs.getString(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BYTE_ARRAY:
+                    assertNull(rs.getBytes(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unexpected type: " + 
columnType);
+            }
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullNamed(ColumnType columnType) throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
columnType, 0, 0, false), null)) {
+            switch (columnType) {
+                case NULL:
+                    assertNull(rs.getObject("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BOOLEAN:
+                    assertFalse(rs.getBoolean("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT8:
+                    assertEquals(0, rs.getByte("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT16:
+                    assertEquals(0, rs.getShort("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT32:
+                    assertEquals(0, rs.getInt("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT64:
+                    assertEquals(0, rs.getLong("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case FLOAT:
+                    assertEquals(0, rs.getFloat("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DOUBLE:
+                    assertEquals(0, rs.getDouble("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DECIMAL:
+                    assertNull(rs.getBigDecimal("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATE:
+                    assertNull(rs.getDate("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIME:
+                    assertNull(rs.getTime("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATETIME:
+                    assertNull(rs.getTimestamp("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIMESTAMP:
+                    assertNull(rs.getTimestamp("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case UUID:
+                    assertNull(rs.getObject(1, UUID.class));
+                    assertTrue(rs.wasNull());
+                    break;
+                case STRING:
+                    assertNull(rs.getString("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BYTE_ARRAY:
+                    assertNull(rs.getBytes("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unexpected type: " + 
columnType);
+            }
+        }
+    }
+
+    @Test
+    public void getUnknownColumn() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.BOOLEAN, 0, 0, false), 1)) {
+
+            expectInvalidColumn(rs::getBoolean, -1);
+            expectInvalidColumn(rs::getBoolean, 2);
+            expectInvalidColumn(rs::getBoolean, "X");
+
+            expectInvalidColumn(rs::getByte, -1);
+            expectInvalidColumn(rs::getByte, 2);
+            expectInvalidColumn(rs::getByte, "X");
+
+            expectInvalidColumn(rs::getShort, -1);
+            expectInvalidColumn(rs::getShort, 2);
+            expectInvalidColumn(rs::getShort, "X");
+
+            expectInvalidColumn(rs::getInt, -1);
+            expectInvalidColumn(rs::getInt, 2);
+            expectInvalidColumn(rs::getInt, "X");
+
+            expectInvalidColumn(rs::getLong, -1);
+            expectInvalidColumn(rs::getLong, 2);
+            expectInvalidColumn(rs::getLong, "X");
+
+            expectInvalidColumn(rs::getFloat, -1);
+            expectInvalidColumn(rs::getFloat, 2);
+            expectInvalidColumn(rs::getFloat, "X");
+
+            expectInvalidColumn(rs::getDouble, -1);
+            expectInvalidColumn(rs::getDouble, 2);
+            expectInvalidColumn(rs::getDouble, "X");
+
+            expectInvalidColumn(rs::getBigDecimal, -1);
+            expectInvalidColumn(rs::getBigDecimal, 2);
+            expectInvalidColumn(rs::getBigDecimal, "X");
+
+            expectInvalidColumn(rs::getDate, -1);
+            expectInvalidColumn(rs::getDate, 2);
+            expectInvalidColumn(rs::getDate, "X");
+
+            expectInvalidColumn(rs::getTime, -1);
+            expectInvalidColumn(rs::getTime, 2);
+            expectInvalidColumn(rs::getTime, "X");
+
+            expectInvalidColumn(rs::getTimestamp, -1);
+            expectInvalidColumn(rs::getTimestamp, 2);
+            expectInvalidColumn(rs::getTimestamp, "X");
+
+            expectInvalidColumn(rs::getString, -1);
+            expectInvalidColumn(rs::getString, 2);
+            expectInvalidColumn(rs::getString, "X");
+
+            expectInvalidColumn(rs::getNString, -1);
+            expectInvalidColumn(rs::getNString, 2);
+            expectInvalidColumn(rs::getNString, "X");
+
+            expectInvalidColumn(rs::getObject, -1);
+            expectInvalidColumn(rs::getObject, 2);
+            expectInvalidColumn(rs::getObject, "X");
+
+            expectSqlException(() -> rs.getObject(-1, Integer.class), "Invalid 
column index: -1");
+            expectSqlException(() -> rs.getObject(2, Integer.class), "Invalid 
column index: 2");
+            expectSqlException(() -> rs.getObject("X", Integer.class), "Column 
not found: X");
+
+            expectSqlException(() -> rs.getObject(-1, Map.of()), "SQL 
structured type are not supported");
+            expectSqlException(() -> rs.getObject(2, Map.of()), "SQL 
structured type are not supported");
+            expectSqlException(() -> rs.getObject("X", Map.of()), "SQL 
structured type are not supported");
+        }
+    }
+
+    @Test
+    public void methodsArePositioned() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.BOOLEAN, 0, 0, 
false)),
+                List.of())
+        ) {
+            expectPositioned(rs::wasNull);
+
+            expectPositioned(() -> rs.getBoolean(1));
+            expectPositioned(() -> rs.getBoolean("C"));
+
+            expectPositioned(() -> rs.getByte(1));
+            expectPositioned(() -> rs.getByte("C"));
+
+            expectPositioned(() -> rs.getShort(1));
+            expectPositioned(() -> rs.getShort("C"));
+
+            expectPositioned(() -> rs.getInt(1));
+            expectPositioned(() -> rs.getInt("C"));
+
+            expectPositioned(() -> rs.getLong(1));
+            expectPositioned(() -> rs.getLong("C"));
+
+            expectPositioned(() -> rs.getFloat(1));
+            expectPositioned(() -> rs.getFloat("C"));
+
+            expectPositioned(() -> rs.getDouble(1));
+            expectPositioned(() -> rs.getDouble("C"));
+
+            expectPositioned(() -> rs.getBigDecimal(1));
+            expectPositioned(() -> rs.getBigDecimal("C"));
+
+            expectPositioned(() -> rs.getBigDecimal(1, 2));
+            expectPositioned(() -> rs.getBigDecimal("C", 3));

Review Comment:
   please check warnings in other places too



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {
+        return createPositionedMulti(new ColumnDefinition[]{col}, new 
Object[]{value});
+    }
+
+    private ResultSet createPositionedMulti(@Nullable ZoneId zoneId, 
ColumnDefinition[] columns, Object[] values) throws SQLException {
+        if (columns.length != values.length) {
+            throw new IllegalArgumentException("cols, values must have the 
same length");
+        }
+
+        List<ColumnDefinition> cols = Arrays.asList(columns);
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(values));
+
+        ResultSet rs = createResultSet(zoneId, cols, rows);
+        assertTrue(rs.next());
+        return rs;
+    }
+
+    private ResultSet createPositionedMulti(ColumnDefinition[] columns, 
Object[] values) throws SQLException {
+        return createPositionedMulti(null, columns, values);
+    }
+
+    @Test
+    public void getNotSupportedTypes() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.getArray(1));
+            expectNotSupported(() -> rs.getArray("C"));
+
+            expectNotSupported(() -> rs.getAsciiStream(1));
+            expectNotSupported(() -> rs.getAsciiStream("C"));
+
+            expectNotSupported(() -> rs.getBinaryStream(1));
+            expectNotSupported(() -> rs.getBinaryStream("C"));
+
+            expectNotSupported(() -> rs.getBlob(1));
+            expectNotSupported(() -> rs.getBlob("C"));
+
+            expectNotSupported(() -> rs.getClob(1));
+            expectNotSupported(() -> rs.getClob("C"));
+
+            expectNotSupported(() -> rs.getCharacterStream(1));
+            expectNotSupported(() -> rs.getCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNCharacterStream(1));
+            expectNotSupported(() -> rs.getNCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNClob(1));
+            expectNotSupported(() -> rs.getNClob("C"));
+
+            expectNotSupported(() -> rs.getRef(1));
+            expectNotSupported(() -> rs.getRef("C"));
+
+            expectNotSupported(() -> rs.getRowId(1));
+            expectNotSupported(() -> rs.getRowId("C"));
+
+            expectNotSupported(() -> rs.getSQLXML(1));
+            expectNotSupported(() -> rs.getSQLXML("C"));
+
+            expectNotSupported(() -> rs.getObject(1, Map.of()));
+            expectNotSupported(() -> rs.getObject("C", Map.of()));
+        }
+    }
+
+    @Test
+    public void updateMethodsAreNotSupported() throws Exception {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.updateBoolean(1, true));
+            expectNotSupported(() -> rs.updateBoolean("C", true));
+
+            expectNotSupported(() -> rs.updateByte(1, (byte) 0));
+            expectNotSupported(() -> rs.updateByte("C", (byte) 0));
+
+            expectNotSupported(() -> rs.updateShort(1, (short) 0));
+            expectNotSupported(() -> rs.updateShort("C", (short) 0));
+
+            expectNotSupported(() -> rs.updateInt(1, 0));
+            expectNotSupported(() -> rs.updateInt("C", 0));
+
+            expectNotSupported(() -> rs.updateLong(1, 0));
+            expectNotSupported(() -> rs.updateLong("C", 0));
+
+            expectNotSupported(() -> rs.updateFloat(1, (float) 0.0));
+            expectNotSupported(() -> rs.updateFloat("C", (float) 0.0));
+
+            expectNotSupported(() -> rs.updateDouble(1, 0.0));
+            expectNotSupported(() -> rs.updateDouble("C", 0.0));
+
+            expectNotSupported(() -> rs.updateString(1, ""));
+            expectNotSupported(() -> rs.updateString("C", ""));
+
+            expectNotSupported(() -> rs.updateTime(1, new Time(0)));
+            expectNotSupported(() -> rs.updateTime("C", new Time(0)));
+
+            expectNotSupported(() -> rs.updateDate(1, new Date(0)));
+            expectNotSupported(() -> rs.updateDate("C", new Date(0)));
+
+            expectNotSupported(() -> rs.updateTimestamp(1, new Timestamp(0)));
+            expectNotSupported(() -> rs.updateTimestamp("C", new 
Timestamp(0)));
+
+            expectNotSupported(() -> rs.updateBytes(1, new byte[]{1}));
+            expectNotSupported(() -> rs.updateBytes("C", new byte[]{1}));
+
+            expectNotSupported(() -> rs.updateArray(1, null));
+            expectNotSupported(() -> rs.updateArray("C", null));
+
+            expectNotSupported(() -> rs.updateBlob(1, (Blob) null));
+            expectNotSupported(() -> rs.updateBlob(1, (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob(1, null, 0L));
+            expectNotSupported(() -> rs.updateBlob("C", (Blob) null));
+            expectNotSupported(() -> rs.updateBlob("C", (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateClob(1, (Clob) null));
+            expectNotSupported(() -> rs.updateClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateClob("C", (Clob) null));
+            expectNotSupported(() -> rs.updateClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNClob(1, (NClob) null));
+            expectNotSupported(() -> rs.updateNClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateNClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateNClob("C", (NClob) null));
+            expectNotSupported(() -> rs.updateNClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateNClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateAsciiStream(1, null));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateBinaryStream(1, null));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateRef(1, null));
+            expectNotSupported(() -> rs.updateRef("C", null));
+
+            expectNotSupported(() -> rs.updateRowId(1, null));
+            expectNotSupported(() -> rs.updateRowId("C", null));
+
+            expectNotSupported(() -> rs.updateNString(1, null));
+            expectNotSupported(() -> rs.updateNString("C", null));
+
+            expectNotSupported(() -> rs.updateSQLXML(1, null));
+            expectNotSupported(() -> rs.updateSQLXML("C", null));
+
+            expectNotSupported(() -> rs.updateObject(1, null));
+            expectNotSupported(() -> rs.updateObject(1, null, 0));
+            expectNotSupported(() -> rs.updateObject("C", null));
+            expectNotSupported(() -> rs.updateObject("C", null, 0));
+
+            expectNotSupported(() -> rs.updateBigDecimal(1, null));
+            expectNotSupported(() -> rs.updateBigDecimal("C", null));
+
+            expectNotSupported(() -> rs.updateNull(1));
+            expectNotSupported(() -> rs.updateNull("C"));
+
+            expectNotSupported(rs::cancelRowUpdates);
+
+            expectNotSupported(rs::updateRow);
+
+            expectNotSupported(rs::deleteRow);
+
+            expectNotSupported(rs::insertRow);
+
+            expectNotSupported(rs::moveToInsertRow);
+        }
+    }
+
+    @Test
+    public void navigationMethods() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            assertTrue(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertTrue(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(1, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertTrue(rs.isLast());
+            assertEquals(2, rs.getRow());
+
+            assertFalse(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertTrue(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+        }
+
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            String error = "Result set is forward-only.";
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            assertTrue(rs.next());
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            expectSqlException(() -> rs.absolute(0), error);
+            expectSqlException(() -> rs.relative(0), error);
+            expectSqlException(rs::previous, error);
+
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+            rs.setFetchDirection(ResultSet.FETCH_FORWARD);
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+
+            assertEquals(ResultSet.CONCUR_READ_ONLY, rs.getConcurrency());
+            assertEquals(ResultSet.TYPE_FORWARD_ONLY, rs.getType());
+            assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, 
rs.getHoldability());
+
+            expectSqlException(rs::moveToCurrentRow, "The result set 
concurrency is CONCUR_READ_ONLY");
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullPositional(ColumnType columnType) throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
columnType, 0, 0, false), null)) {
+            switch (columnType) {
+                case NULL:
+                    assertNull(rs.getObject(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BOOLEAN:
+                    assertFalse(rs.getBoolean(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT8:
+                    assertEquals(0, rs.getByte(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT16:
+                    assertEquals(0, rs.getShort(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT32:
+                    assertEquals(0, rs.getInt(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT64:
+                    assertEquals(0, rs.getLong(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case FLOAT:
+                    assertEquals(0, rs.getFloat(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DOUBLE:
+                    assertEquals(0, rs.getDouble(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DECIMAL:
+                    assertNull(rs.getBigDecimal(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATE:
+                    assertNull(rs.getDate(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIME:
+                    assertNull(rs.getTime(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATETIME:
+                    assertNull(rs.getTimestamp(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIMESTAMP:
+                    assertNull(rs.getTimestamp(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case UUID:
+                    assertNull(rs.getObject(1, UUID.class));
+                    assertTrue(rs.wasNull());
+                    break;
+                case STRING:
+                    assertNull(rs.getString(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BYTE_ARRAY:
+                    assertNull(rs.getBytes(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unexpected type: " + 
columnType);
+            }
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullNamed(ColumnType columnType) throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
columnType, 0, 0, false), null)) {
+            switch (columnType) {
+                case NULL:
+                    assertNull(rs.getObject("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BOOLEAN:
+                    assertFalse(rs.getBoolean("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT8:
+                    assertEquals(0, rs.getByte("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT16:
+                    assertEquals(0, rs.getShort("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT32:
+                    assertEquals(0, rs.getInt("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT64:
+                    assertEquals(0, rs.getLong("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case FLOAT:
+                    assertEquals(0, rs.getFloat("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DOUBLE:
+                    assertEquals(0, rs.getDouble("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DECIMAL:
+                    assertNull(rs.getBigDecimal("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATE:
+                    assertNull(rs.getDate("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIME:
+                    assertNull(rs.getTime("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATETIME:
+                    assertNull(rs.getTimestamp("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIMESTAMP:
+                    assertNull(rs.getTimestamp("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case UUID:
+                    assertNull(rs.getObject(1, UUID.class));
+                    assertTrue(rs.wasNull());
+                    break;
+                case STRING:
+                    assertNull(rs.getString("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BYTE_ARRAY:
+                    assertNull(rs.getBytes("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unexpected type: " + 
columnType);
+            }
+        }
+    }
+
+    @Test
+    public void getUnknownColumn() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.BOOLEAN, 0, 0, false), 1)) {
+
+            expectInvalidColumn(rs::getBoolean, -1);
+            expectInvalidColumn(rs::getBoolean, 2);
+            expectInvalidColumn(rs::getBoolean, "X");
+
+            expectInvalidColumn(rs::getByte, -1);
+            expectInvalidColumn(rs::getByte, 2);
+            expectInvalidColumn(rs::getByte, "X");
+
+            expectInvalidColumn(rs::getShort, -1);
+            expectInvalidColumn(rs::getShort, 2);
+            expectInvalidColumn(rs::getShort, "X");
+
+            expectInvalidColumn(rs::getInt, -1);
+            expectInvalidColumn(rs::getInt, 2);
+            expectInvalidColumn(rs::getInt, "X");
+
+            expectInvalidColumn(rs::getLong, -1);
+            expectInvalidColumn(rs::getLong, 2);
+            expectInvalidColumn(rs::getLong, "X");
+
+            expectInvalidColumn(rs::getFloat, -1);
+            expectInvalidColumn(rs::getFloat, 2);
+            expectInvalidColumn(rs::getFloat, "X");
+
+            expectInvalidColumn(rs::getDouble, -1);
+            expectInvalidColumn(rs::getDouble, 2);
+            expectInvalidColumn(rs::getDouble, "X");
+
+            expectInvalidColumn(rs::getBigDecimal, -1);
+            expectInvalidColumn(rs::getBigDecimal, 2);
+            expectInvalidColumn(rs::getBigDecimal, "X");
+
+            expectInvalidColumn(rs::getDate, -1);
+            expectInvalidColumn(rs::getDate, 2);
+            expectInvalidColumn(rs::getDate, "X");
+
+            expectInvalidColumn(rs::getTime, -1);
+            expectInvalidColumn(rs::getTime, 2);
+            expectInvalidColumn(rs::getTime, "X");
+
+            expectInvalidColumn(rs::getTimestamp, -1);
+            expectInvalidColumn(rs::getTimestamp, 2);
+            expectInvalidColumn(rs::getTimestamp, "X");
+
+            expectInvalidColumn(rs::getString, -1);
+            expectInvalidColumn(rs::getString, 2);
+            expectInvalidColumn(rs::getString, "X");
+
+            expectInvalidColumn(rs::getNString, -1);
+            expectInvalidColumn(rs::getNString, 2);
+            expectInvalidColumn(rs::getNString, "X");
+
+            expectInvalidColumn(rs::getObject, -1);
+            expectInvalidColumn(rs::getObject, 2);
+            expectInvalidColumn(rs::getObject, "X");
+
+            expectSqlException(() -> rs.getObject(-1, Integer.class), "Invalid 
column index: -1");
+            expectSqlException(() -> rs.getObject(2, Integer.class), "Invalid 
column index: 2");
+            expectSqlException(() -> rs.getObject("X", Integer.class), "Column 
not found: X");
+
+            expectSqlException(() -> rs.getObject(-1, Map.of()), "SQL 
structured type are not supported");
+            expectSqlException(() -> rs.getObject(2, Map.of()), "SQL 
structured type are not supported");
+            expectSqlException(() -> rs.getObject("X", Map.of()), "SQL 
structured type are not supported");
+        }
+    }
+
+    @Test
+    public void methodsArePositioned() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.BOOLEAN, 0, 0, 
false)),
+                List.of())
+        ) {
+            expectPositioned(rs::wasNull);
+
+            expectPositioned(() -> rs.getBoolean(1));
+            expectPositioned(() -> rs.getBoolean("C"));
+
+            expectPositioned(() -> rs.getByte(1));
+            expectPositioned(() -> rs.getByte("C"));
+
+            expectPositioned(() -> rs.getShort(1));
+            expectPositioned(() -> rs.getShort("C"));
+
+            expectPositioned(() -> rs.getInt(1));
+            expectPositioned(() -> rs.getInt("C"));
+
+            expectPositioned(() -> rs.getLong(1));
+            expectPositioned(() -> rs.getLong("C"));
+
+            expectPositioned(() -> rs.getFloat(1));
+            expectPositioned(() -> rs.getFloat("C"));
+
+            expectPositioned(() -> rs.getDouble(1));
+            expectPositioned(() -> rs.getDouble("C"));
+
+            expectPositioned(() -> rs.getBigDecimal(1));
+            expectPositioned(() -> rs.getBigDecimal("C"));
+
+            expectPositioned(() -> rs.getBigDecimal(1, 2));
+            expectPositioned(() -> rs.getBigDecimal("C", 3));
+
+            expectPositioned(() -> rs.getDate(1));
+            expectPositioned(() -> rs.getDate("C"));
+
+            expectPositioned(() -> rs.getTime(1));
+            expectPositioned(() -> rs.getTime("C"));
+
+            expectPositioned(() -> rs.getTimestamp(1));
+            expectPositioned(() -> rs.getTimestamp("C"));
+
+            expectPositioned(() -> rs.getString(1));
+            expectPositioned(() -> rs.getString("C"));
+
+            expectPositioned(() -> rs.getNString(1));
+            expectPositioned(() -> rs.getNString("C"));
+
+            expectPositioned(() -> rs.getObject(1));
+            expectPositioned(() -> rs.getObject("C"));
+
+            expectPositioned(() -> rs.getObject(1, Boolean.class));
+            expectPositioned(() -> rs.getObject("C", Boolean.class));
+
+            expectPositioned(() -> rs.getBytes(1));
+            expectPositioned(() -> rs.getBytes("C"));
+
+            expectPositioned(() -> rs.getURL(1));
+            expectPositioned(() -> rs.getURL("C"));
+
+            assertNotNull(rs.getMetaData());

Review Comment:
   I feel like this and below checks belong to a different method



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {

Review Comment:
   ```suggestion
       protected final ResultSet createPositionedSingle(ColumnDefinition col, 
@Nullable Object value) throws SQLException {
   ```



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {
+        return createPositionedMulti(new ColumnDefinition[]{col}, new 
Object[]{value});
+    }
+
+    private ResultSet createPositionedMulti(@Nullable ZoneId zoneId, 
ColumnDefinition[] columns, Object[] values) throws SQLException {
+        if (columns.length != values.length) {
+            throw new IllegalArgumentException("cols, values must have the 
same length");
+        }
+
+        List<ColumnDefinition> cols = Arrays.asList(columns);
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(values));
+
+        ResultSet rs = createResultSet(zoneId, cols, rows);
+        assertTrue(rs.next());
+        return rs;
+    }
+
+    private ResultSet createPositionedMulti(ColumnDefinition[] columns, 
Object[] values) throws SQLException {
+        return createPositionedMulti(null, columns, values);
+    }
+
+    @Test
+    public void getNotSupportedTypes() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.getArray(1));
+            expectNotSupported(() -> rs.getArray("C"));
+
+            expectNotSupported(() -> rs.getAsciiStream(1));
+            expectNotSupported(() -> rs.getAsciiStream("C"));
+
+            expectNotSupported(() -> rs.getBinaryStream(1));
+            expectNotSupported(() -> rs.getBinaryStream("C"));
+
+            expectNotSupported(() -> rs.getBlob(1));
+            expectNotSupported(() -> rs.getBlob("C"));
+
+            expectNotSupported(() -> rs.getClob(1));
+            expectNotSupported(() -> rs.getClob("C"));
+
+            expectNotSupported(() -> rs.getCharacterStream(1));
+            expectNotSupported(() -> rs.getCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNCharacterStream(1));
+            expectNotSupported(() -> rs.getNCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNClob(1));
+            expectNotSupported(() -> rs.getNClob("C"));
+
+            expectNotSupported(() -> rs.getRef(1));
+            expectNotSupported(() -> rs.getRef("C"));
+
+            expectNotSupported(() -> rs.getRowId(1));
+            expectNotSupported(() -> rs.getRowId("C"));
+
+            expectNotSupported(() -> rs.getSQLXML(1));
+            expectNotSupported(() -> rs.getSQLXML("C"));
+
+            expectNotSupported(() -> rs.getObject(1, Map.of()));
+            expectNotSupported(() -> rs.getObject("C", Map.of()));
+        }
+    }
+
+    @Test
+    public void updateMethodsAreNotSupported() throws Exception {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.updateBoolean(1, true));
+            expectNotSupported(() -> rs.updateBoolean("C", true));
+
+            expectNotSupported(() -> rs.updateByte(1, (byte) 0));
+            expectNotSupported(() -> rs.updateByte("C", (byte) 0));
+
+            expectNotSupported(() -> rs.updateShort(1, (short) 0));
+            expectNotSupported(() -> rs.updateShort("C", (short) 0));
+
+            expectNotSupported(() -> rs.updateInt(1, 0));
+            expectNotSupported(() -> rs.updateInt("C", 0));
+
+            expectNotSupported(() -> rs.updateLong(1, 0));
+            expectNotSupported(() -> rs.updateLong("C", 0));
+
+            expectNotSupported(() -> rs.updateFloat(1, (float) 0.0));
+            expectNotSupported(() -> rs.updateFloat("C", (float) 0.0));

Review Comment:
   ```suggestion
               expectNotSupported(() -> rs.updateFloat(1, 0.0f));
               expectNotSupported(() -> rs.updateFloat("C", 0.0f));
   ```
   
   just to get rid of warnings in IntelliJ IDEA



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {
+        return createPositionedMulti(new ColumnDefinition[]{col}, new 
Object[]{value});
+    }
+
+    private ResultSet createPositionedMulti(@Nullable ZoneId zoneId, 
ColumnDefinition[] columns, Object[] values) throws SQLException {
+        if (columns.length != values.length) {
+            throw new IllegalArgumentException("cols, values must have the 
same length");
+        }
+
+        List<ColumnDefinition> cols = Arrays.asList(columns);
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(values));
+
+        ResultSet rs = createResultSet(zoneId, cols, rows);
+        assertTrue(rs.next());
+        return rs;
+    }
+
+    private ResultSet createPositionedMulti(ColumnDefinition[] columns, 
Object[] values) throws SQLException {
+        return createPositionedMulti(null, columns, values);
+    }
+
+    @Test
+    public void getNotSupportedTypes() throws SQLException {

Review Comment:
   let's split this tests on two. First one should contain only methods which 
declares throwing `SQLFeatureNotSupportedException` (i.e. `getArray`, 
`getRef`). Second test should contain method which throws 
`SQLFeatureNotSupportedException` but does not explicitly declare this (i.e. 
`getCharacterStream`, `getAsciiStream`)



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {
+        return createPositionedMulti(new ColumnDefinition[]{col}, new 
Object[]{value});
+    }
+
+    private ResultSet createPositionedMulti(@Nullable ZoneId zoneId, 
ColumnDefinition[] columns, Object[] values) throws SQLException {
+        if (columns.length != values.length) {
+            throw new IllegalArgumentException("cols, values must have the 
same length");
+        }
+
+        List<ColumnDefinition> cols = Arrays.asList(columns);
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(values));
+
+        ResultSet rs = createResultSet(zoneId, cols, rows);
+        assertTrue(rs.next());
+        return rs;
+    }
+
+    private ResultSet createPositionedMulti(ColumnDefinition[] columns, 
Object[] values) throws SQLException {
+        return createPositionedMulti(null, columns, values);
+    }
+
+    @Test
+    public void getNotSupportedTypes() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.getArray(1));
+            expectNotSupported(() -> rs.getArray("C"));
+
+            expectNotSupported(() -> rs.getAsciiStream(1));
+            expectNotSupported(() -> rs.getAsciiStream("C"));
+
+            expectNotSupported(() -> rs.getBinaryStream(1));
+            expectNotSupported(() -> rs.getBinaryStream("C"));
+
+            expectNotSupported(() -> rs.getBlob(1));
+            expectNotSupported(() -> rs.getBlob("C"));
+
+            expectNotSupported(() -> rs.getClob(1));
+            expectNotSupported(() -> rs.getClob("C"));
+
+            expectNotSupported(() -> rs.getCharacterStream(1));
+            expectNotSupported(() -> rs.getCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNCharacterStream(1));
+            expectNotSupported(() -> rs.getNCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNClob(1));
+            expectNotSupported(() -> rs.getNClob("C"));
+
+            expectNotSupported(() -> rs.getRef(1));
+            expectNotSupported(() -> rs.getRef("C"));
+
+            expectNotSupported(() -> rs.getRowId(1));
+            expectNotSupported(() -> rs.getRowId("C"));
+
+            expectNotSupported(() -> rs.getSQLXML(1));
+            expectNotSupported(() -> rs.getSQLXML("C"));
+
+            expectNotSupported(() -> rs.getObject(1, Map.of()));
+            expectNotSupported(() -> rs.getObject("C", Map.of()));
+        }
+    }
+
+    @Test
+    public void updateMethodsAreNotSupported() throws Exception {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.updateBoolean(1, true));
+            expectNotSupported(() -> rs.updateBoolean("C", true));
+
+            expectNotSupported(() -> rs.updateByte(1, (byte) 0));
+            expectNotSupported(() -> rs.updateByte("C", (byte) 0));
+
+            expectNotSupported(() -> rs.updateShort(1, (short) 0));
+            expectNotSupported(() -> rs.updateShort("C", (short) 0));
+
+            expectNotSupported(() -> rs.updateInt(1, 0));
+            expectNotSupported(() -> rs.updateInt("C", 0));
+
+            expectNotSupported(() -> rs.updateLong(1, 0));
+            expectNotSupported(() -> rs.updateLong("C", 0));
+
+            expectNotSupported(() -> rs.updateFloat(1, (float) 0.0));
+            expectNotSupported(() -> rs.updateFloat("C", (float) 0.0));
+
+            expectNotSupported(() -> rs.updateDouble(1, 0.0));
+            expectNotSupported(() -> rs.updateDouble("C", 0.0));
+
+            expectNotSupported(() -> rs.updateString(1, ""));
+            expectNotSupported(() -> rs.updateString("C", ""));
+
+            expectNotSupported(() -> rs.updateTime(1, new Time(0)));
+            expectNotSupported(() -> rs.updateTime("C", new Time(0)));
+
+            expectNotSupported(() -> rs.updateDate(1, new Date(0)));
+            expectNotSupported(() -> rs.updateDate("C", new Date(0)));
+
+            expectNotSupported(() -> rs.updateTimestamp(1, new Timestamp(0)));
+            expectNotSupported(() -> rs.updateTimestamp("C", new 
Timestamp(0)));
+
+            expectNotSupported(() -> rs.updateBytes(1, new byte[]{1}));
+            expectNotSupported(() -> rs.updateBytes("C", new byte[]{1}));
+
+            expectNotSupported(() -> rs.updateArray(1, null));
+            expectNotSupported(() -> rs.updateArray("C", null));
+
+            expectNotSupported(() -> rs.updateBlob(1, (Blob) null));
+            expectNotSupported(() -> rs.updateBlob(1, (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob(1, null, 0L));
+            expectNotSupported(() -> rs.updateBlob("C", (Blob) null));
+            expectNotSupported(() -> rs.updateBlob("C", (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateClob(1, (Clob) null));
+            expectNotSupported(() -> rs.updateClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateClob("C", (Clob) null));
+            expectNotSupported(() -> rs.updateClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNClob(1, (NClob) null));
+            expectNotSupported(() -> rs.updateNClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateNClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateNClob("C", (NClob) null));
+            expectNotSupported(() -> rs.updateNClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateNClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateAsciiStream(1, null));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateBinaryStream(1, null));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateRef(1, null));
+            expectNotSupported(() -> rs.updateRef("C", null));
+
+            expectNotSupported(() -> rs.updateRowId(1, null));
+            expectNotSupported(() -> rs.updateRowId("C", null));
+
+            expectNotSupported(() -> rs.updateNString(1, null));
+            expectNotSupported(() -> rs.updateNString("C", null));
+
+            expectNotSupported(() -> rs.updateSQLXML(1, null));
+            expectNotSupported(() -> rs.updateSQLXML("C", null));
+
+            expectNotSupported(() -> rs.updateObject(1, null));
+            expectNotSupported(() -> rs.updateObject(1, null, 0));
+            expectNotSupported(() -> rs.updateObject("C", null));
+            expectNotSupported(() -> rs.updateObject("C", null, 0));
+
+            expectNotSupported(() -> rs.updateBigDecimal(1, null));
+            expectNotSupported(() -> rs.updateBigDecimal("C", null));
+
+            expectNotSupported(() -> rs.updateNull(1));
+            expectNotSupported(() -> rs.updateNull("C"));
+
+            expectNotSupported(rs::cancelRowUpdates);
+
+            expectNotSupported(rs::updateRow);
+
+            expectNotSupported(rs::deleteRow);
+
+            expectNotSupported(rs::insertRow);
+
+            expectNotSupported(rs::moveToInsertRow);
+        }
+    }
+
+    @Test
+    public void navigationMethods() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            assertTrue(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertTrue(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(1, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertTrue(rs.isLast());
+            assertEquals(2, rs.getRow());
+
+            assertFalse(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertTrue(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+        }
+
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            String error = "Result set is forward-only.";
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            assertTrue(rs.next());
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            expectSqlException(() -> rs.absolute(0), error);
+            expectSqlException(() -> rs.relative(0), error);
+            expectSqlException(rs::previous, error);
+
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+            rs.setFetchDirection(ResultSet.FETCH_FORWARD);
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+
+            assertEquals(ResultSet.CONCUR_READ_ONLY, rs.getConcurrency());
+            assertEquals(ResultSet.TYPE_FORWARD_ONLY, rs.getType());
+            assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, 
rs.getHoldability());
+
+            expectSqlException(rs::moveToCurrentRow, "The result set 
concurrency is CONCUR_READ_ONLY");
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullPositional(ColumnType columnType) throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
columnType, 0, 0, false), null)) {

Review Comment:
   I replaced implementation of `wasNull` with this
   ```
       public boolean wasNull() throws SQLException {
           ensureNotClosed();
           ensureHasCurrentRow();
   
           return true;
       }
   ```
   and all tests have passed



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {
+        return createPositionedMulti(new ColumnDefinition[]{col}, new 
Object[]{value});
+    }
+
+    private ResultSet createPositionedMulti(@Nullable ZoneId zoneId, 
ColumnDefinition[] columns, Object[] values) throws SQLException {
+        if (columns.length != values.length) {
+            throw new IllegalArgumentException("cols, values must have the 
same length");
+        }
+
+        List<ColumnDefinition> cols = Arrays.asList(columns);
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(values));
+
+        ResultSet rs = createResultSet(zoneId, cols, rows);
+        assertTrue(rs.next());
+        return rs;
+    }
+
+    private ResultSet createPositionedMulti(ColumnDefinition[] columns, 
Object[] values) throws SQLException {
+        return createPositionedMulti(null, columns, values);
+    }
+
+    @Test
+    public void getNotSupportedTypes() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.getArray(1));
+            expectNotSupported(() -> rs.getArray("C"));
+
+            expectNotSupported(() -> rs.getAsciiStream(1));
+            expectNotSupported(() -> rs.getAsciiStream("C"));
+
+            expectNotSupported(() -> rs.getBinaryStream(1));
+            expectNotSupported(() -> rs.getBinaryStream("C"));
+
+            expectNotSupported(() -> rs.getBlob(1));
+            expectNotSupported(() -> rs.getBlob("C"));
+
+            expectNotSupported(() -> rs.getClob(1));
+            expectNotSupported(() -> rs.getClob("C"));
+
+            expectNotSupported(() -> rs.getCharacterStream(1));
+            expectNotSupported(() -> rs.getCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNCharacterStream(1));
+            expectNotSupported(() -> rs.getNCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNClob(1));
+            expectNotSupported(() -> rs.getNClob("C"));
+
+            expectNotSupported(() -> rs.getRef(1));
+            expectNotSupported(() -> rs.getRef("C"));
+
+            expectNotSupported(() -> rs.getRowId(1));
+            expectNotSupported(() -> rs.getRowId("C"));
+
+            expectNotSupported(() -> rs.getSQLXML(1));
+            expectNotSupported(() -> rs.getSQLXML("C"));
+
+            expectNotSupported(() -> rs.getObject(1, Map.of()));
+            expectNotSupported(() -> rs.getObject("C", Map.of()));
+        }
+    }
+
+    @Test
+    public void updateMethodsAreNotSupported() throws Exception {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.updateBoolean(1, true));
+            expectNotSupported(() -> rs.updateBoolean("C", true));
+
+            expectNotSupported(() -> rs.updateByte(1, (byte) 0));
+            expectNotSupported(() -> rs.updateByte("C", (byte) 0));
+
+            expectNotSupported(() -> rs.updateShort(1, (short) 0));
+            expectNotSupported(() -> rs.updateShort("C", (short) 0));
+
+            expectNotSupported(() -> rs.updateInt(1, 0));
+            expectNotSupported(() -> rs.updateInt("C", 0));
+
+            expectNotSupported(() -> rs.updateLong(1, 0));
+            expectNotSupported(() -> rs.updateLong("C", 0));
+
+            expectNotSupported(() -> rs.updateFloat(1, (float) 0.0));
+            expectNotSupported(() -> rs.updateFloat("C", (float) 0.0));
+
+            expectNotSupported(() -> rs.updateDouble(1, 0.0));
+            expectNotSupported(() -> rs.updateDouble("C", 0.0));
+
+            expectNotSupported(() -> rs.updateString(1, ""));
+            expectNotSupported(() -> rs.updateString("C", ""));
+
+            expectNotSupported(() -> rs.updateTime(1, new Time(0)));
+            expectNotSupported(() -> rs.updateTime("C", new Time(0)));
+
+            expectNotSupported(() -> rs.updateDate(1, new Date(0)));
+            expectNotSupported(() -> rs.updateDate("C", new Date(0)));
+
+            expectNotSupported(() -> rs.updateTimestamp(1, new Timestamp(0)));
+            expectNotSupported(() -> rs.updateTimestamp("C", new 
Timestamp(0)));
+
+            expectNotSupported(() -> rs.updateBytes(1, new byte[]{1}));
+            expectNotSupported(() -> rs.updateBytes("C", new byte[]{1}));
+
+            expectNotSupported(() -> rs.updateArray(1, null));
+            expectNotSupported(() -> rs.updateArray("C", null));
+
+            expectNotSupported(() -> rs.updateBlob(1, (Blob) null));
+            expectNotSupported(() -> rs.updateBlob(1, (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob(1, null, 0L));
+            expectNotSupported(() -> rs.updateBlob("C", (Blob) null));
+            expectNotSupported(() -> rs.updateBlob("C", (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateClob(1, (Clob) null));
+            expectNotSupported(() -> rs.updateClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateClob("C", (Clob) null));
+            expectNotSupported(() -> rs.updateClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNClob(1, (NClob) null));
+            expectNotSupported(() -> rs.updateNClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateNClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateNClob("C", (NClob) null));
+            expectNotSupported(() -> rs.updateNClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateNClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateAsciiStream(1, null));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateBinaryStream(1, null));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateRef(1, null));
+            expectNotSupported(() -> rs.updateRef("C", null));
+
+            expectNotSupported(() -> rs.updateRowId(1, null));
+            expectNotSupported(() -> rs.updateRowId("C", null));
+
+            expectNotSupported(() -> rs.updateNString(1, null));
+            expectNotSupported(() -> rs.updateNString("C", null));
+
+            expectNotSupported(() -> rs.updateSQLXML(1, null));
+            expectNotSupported(() -> rs.updateSQLXML("C", null));
+
+            expectNotSupported(() -> rs.updateObject(1, null));
+            expectNotSupported(() -> rs.updateObject(1, null, 0));
+            expectNotSupported(() -> rs.updateObject("C", null));
+            expectNotSupported(() -> rs.updateObject("C", null, 0));
+
+            expectNotSupported(() -> rs.updateBigDecimal(1, null));
+            expectNotSupported(() -> rs.updateBigDecimal("C", null));
+
+            expectNotSupported(() -> rs.updateNull(1));
+            expectNotSupported(() -> rs.updateNull("C"));
+
+            expectNotSupported(rs::cancelRowUpdates);
+
+            expectNotSupported(rs::updateRow);
+
+            expectNotSupported(rs::deleteRow);
+
+            expectNotSupported(rs::insertRow);
+
+            expectNotSupported(rs::moveToInsertRow);
+        }
+    }
+
+    @Test
+    public void navigationMethods() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            assertTrue(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertTrue(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(1, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertTrue(rs.isLast());
+            assertEquals(2, rs.getRow());
+
+            assertFalse(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertTrue(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+        }
+
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            String error = "Result set is forward-only.";
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            assertTrue(rs.next());
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            expectSqlException(() -> rs.absolute(0), error);
+            expectSqlException(() -> rs.relative(0), error);
+            expectSqlException(rs::previous, error);
+
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+            rs.setFetchDirection(ResultSet.FETCH_FORWARD);
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+
+            assertEquals(ResultSet.CONCUR_READ_ONLY, rs.getConcurrency());
+            assertEquals(ResultSet.TYPE_FORWARD_ONLY, rs.getType());
+            assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, 
rs.getHoldability());
+
+            expectSqlException(rs::moveToCurrentRow, "The result set 
concurrency is CONCUR_READ_ONLY");
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullPositional(ColumnType columnType) throws SQLException {

Review Comment:
   let's also add test to record behavior of `wasNull` method which is called 
prior to any column access



##########
modules/jdbc/src/test/java/org/apache/ignite/internal/jdbc/JdbcResultSetBaseSelfTest.java:
##########
@@ -0,0 +1,969 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.ignite.internal.jdbc;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.any;
+import static org.hamcrest.Matchers.containsString;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+import static org.junit.jupiter.api.Assertions.assertNull;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import java.io.InputStream;
+import java.io.Reader;
+import java.sql.Blob;
+import java.sql.Clob;
+import java.sql.Date;
+import java.sql.NClob;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.sql.SQLFeatureNotSupportedException;
+import java.sql.Time;
+import java.sql.Timestamp;
+import java.time.ZoneId;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Calendar;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import org.apache.ignite.internal.testframework.BaseIgniteAbstractTest;
+import org.apache.ignite.sql.ColumnType;
+import org.jetbrains.annotations.Nullable;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.EnumSource;
+
+/**
+ * Compatibility tests to ensure that both JDBC result set adapters behave 
identically for core java.sql.ResultSet methods (excluding
+ * metadata checks).
+ */
+public abstract class JdbcResultSetBaseSelfTest extends BaseIgniteAbstractTest 
{
+
+    private static final Calendar CALENDAR = Calendar.getInstance();
+
+    protected abstract ResultSet createResultSet(
+            @Nullable ZoneId zoneId, 
+            List<ColumnDefinition> cols, 
+            List<List<Object>> rows
+    ) throws SQLException;
+
+    protected final ResultSet createPositionedSingle(ColumnDefinition col, 
Object value) throws SQLException {
+        return createPositionedMulti(new ColumnDefinition[]{col}, new 
Object[]{value});
+    }
+
+    private ResultSet createPositionedMulti(@Nullable ZoneId zoneId, 
ColumnDefinition[] columns, Object[] values) throws SQLException {
+        if (columns.length != values.length) {
+            throw new IllegalArgumentException("cols, values must have the 
same length");
+        }
+
+        List<ColumnDefinition> cols = Arrays.asList(columns);
+        List<List<Object>> rows = new ArrayList<>();
+        rows.add(Arrays.asList(values));
+
+        ResultSet rs = createResultSet(zoneId, cols, rows);
+        assertTrue(rs.next());
+        return rs;
+    }
+
+    private ResultSet createPositionedMulti(ColumnDefinition[] columns, 
Object[] values) throws SQLException {
+        return createPositionedMulti(null, columns, values);
+    }
+
+    @Test
+    public void getNotSupportedTypes() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.getArray(1));
+            expectNotSupported(() -> rs.getArray("C"));
+
+            expectNotSupported(() -> rs.getAsciiStream(1));
+            expectNotSupported(() -> rs.getAsciiStream("C"));
+
+            expectNotSupported(() -> rs.getBinaryStream(1));
+            expectNotSupported(() -> rs.getBinaryStream("C"));
+
+            expectNotSupported(() -> rs.getBlob(1));
+            expectNotSupported(() -> rs.getBlob("C"));
+
+            expectNotSupported(() -> rs.getClob(1));
+            expectNotSupported(() -> rs.getClob("C"));
+
+            expectNotSupported(() -> rs.getCharacterStream(1));
+            expectNotSupported(() -> rs.getCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNCharacterStream(1));
+            expectNotSupported(() -> rs.getNCharacterStream("C"));
+
+            expectNotSupported(() -> rs.getNClob(1));
+            expectNotSupported(() -> rs.getNClob("C"));
+
+            expectNotSupported(() -> rs.getRef(1));
+            expectNotSupported(() -> rs.getRef("C"));
+
+            expectNotSupported(() -> rs.getRowId(1));
+            expectNotSupported(() -> rs.getRowId("C"));
+
+            expectNotSupported(() -> rs.getSQLXML(1));
+            expectNotSupported(() -> rs.getSQLXML("C"));
+
+            expectNotSupported(() -> rs.getObject(1, Map.of()));
+            expectNotSupported(() -> rs.getObject("C", Map.of()));
+        }
+    }
+
+    @Test
+    public void updateMethodsAreNotSupported() throws Exception {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.STRING, 3, 0, false), "ABC")) {
+
+            expectNotSupported(() -> rs.updateBoolean(1, true));
+            expectNotSupported(() -> rs.updateBoolean("C", true));
+
+            expectNotSupported(() -> rs.updateByte(1, (byte) 0));
+            expectNotSupported(() -> rs.updateByte("C", (byte) 0));
+
+            expectNotSupported(() -> rs.updateShort(1, (short) 0));
+            expectNotSupported(() -> rs.updateShort("C", (short) 0));
+
+            expectNotSupported(() -> rs.updateInt(1, 0));
+            expectNotSupported(() -> rs.updateInt("C", 0));
+
+            expectNotSupported(() -> rs.updateLong(1, 0));
+            expectNotSupported(() -> rs.updateLong("C", 0));
+
+            expectNotSupported(() -> rs.updateFloat(1, (float) 0.0));
+            expectNotSupported(() -> rs.updateFloat("C", (float) 0.0));
+
+            expectNotSupported(() -> rs.updateDouble(1, 0.0));
+            expectNotSupported(() -> rs.updateDouble("C", 0.0));
+
+            expectNotSupported(() -> rs.updateString(1, ""));
+            expectNotSupported(() -> rs.updateString("C", ""));
+
+            expectNotSupported(() -> rs.updateTime(1, new Time(0)));
+            expectNotSupported(() -> rs.updateTime("C", new Time(0)));
+
+            expectNotSupported(() -> rs.updateDate(1, new Date(0)));
+            expectNotSupported(() -> rs.updateDate("C", new Date(0)));
+
+            expectNotSupported(() -> rs.updateTimestamp(1, new Timestamp(0)));
+            expectNotSupported(() -> rs.updateTimestamp("C", new 
Timestamp(0)));
+
+            expectNotSupported(() -> rs.updateBytes(1, new byte[]{1}));
+            expectNotSupported(() -> rs.updateBytes("C", new byte[]{1}));
+
+            expectNotSupported(() -> rs.updateArray(1, null));
+            expectNotSupported(() -> rs.updateArray("C", null));
+
+            expectNotSupported(() -> rs.updateBlob(1, (Blob) null));
+            expectNotSupported(() -> rs.updateBlob(1, (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob(1, null, 0L));
+            expectNotSupported(() -> rs.updateBlob("C", (Blob) null));
+            expectNotSupported(() -> rs.updateBlob("C", (InputStream) null));
+            expectNotSupported(() -> rs.updateBlob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateClob(1, (Clob) null));
+            expectNotSupported(() -> rs.updateClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateClob("C", (Clob) null));
+            expectNotSupported(() -> rs.updateClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNClob(1, (NClob) null));
+            expectNotSupported(() -> rs.updateNClob(1, (Reader) null));
+            expectNotSupported(() -> rs.updateNClob(1, null, 0L));
+            expectNotSupported(() -> rs.updateNClob("C", (NClob) null));
+            expectNotSupported(() -> rs.updateNClob("C", (Reader) null));
+            expectNotSupported(() -> rs.updateNClob("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateAsciiStream(1, null));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0));
+            expectNotSupported(() -> rs.updateAsciiStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateBinaryStream(1, null));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0));
+            expectNotSupported(() -> rs.updateBinaryStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream(1, null, 0L));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0));
+            expectNotSupported(() -> rs.updateNCharacterStream("C", null, 0L));
+
+            expectNotSupported(() -> rs.updateRef(1, null));
+            expectNotSupported(() -> rs.updateRef("C", null));
+
+            expectNotSupported(() -> rs.updateRowId(1, null));
+            expectNotSupported(() -> rs.updateRowId("C", null));
+
+            expectNotSupported(() -> rs.updateNString(1, null));
+            expectNotSupported(() -> rs.updateNString("C", null));
+
+            expectNotSupported(() -> rs.updateSQLXML(1, null));
+            expectNotSupported(() -> rs.updateSQLXML("C", null));
+
+            expectNotSupported(() -> rs.updateObject(1, null));
+            expectNotSupported(() -> rs.updateObject(1, null, 0));
+            expectNotSupported(() -> rs.updateObject("C", null));
+            expectNotSupported(() -> rs.updateObject("C", null, 0));
+
+            expectNotSupported(() -> rs.updateBigDecimal(1, null));
+            expectNotSupported(() -> rs.updateBigDecimal("C", null));
+
+            expectNotSupported(() -> rs.updateNull(1));
+            expectNotSupported(() -> rs.updateNull("C"));
+
+            expectNotSupported(rs::cancelRowUpdates);
+
+            expectNotSupported(rs::updateRow);
+
+            expectNotSupported(rs::deleteRow);
+
+            expectNotSupported(rs::insertRow);
+
+            expectNotSupported(rs::moveToInsertRow);
+        }
+    }
+
+    @Test
+    public void navigationMethods() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            assertTrue(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertTrue(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(1, rs.getRow());
+
+            assertTrue(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertFalse(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertTrue(rs.isLast());
+            assertEquals(2, rs.getRow());
+
+            assertFalse(rs.next());
+
+            assertFalse(rs.isBeforeFirst());
+            assertTrue(rs.isAfterLast());
+            assertFalse(rs.isFirst());
+            assertFalse(rs.isLast());
+            assertEquals(0, rs.getRow());
+        }
+
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.STRING, 3, 0, 
false)),
+                List.of(List.of("A"), List.of("B")))
+        ) {
+            String error = "Result set is forward-only.";
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            assertTrue(rs.next());
+
+            expectSqlException(rs::first, error);
+            expectSqlException(rs::afterLast, error);
+            expectSqlException(rs::last, error);
+
+            expectSqlException(() -> rs.absolute(0), error);
+            expectSqlException(() -> rs.relative(0), error);
+            expectSqlException(rs::previous, error);
+
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+            rs.setFetchDirection(ResultSet.FETCH_FORWARD);
+            assertEquals(ResultSet.FETCH_FORWARD, rs.getFetchDirection());
+
+            assertEquals(ResultSet.CONCUR_READ_ONLY, rs.getConcurrency());
+            assertEquals(ResultSet.TYPE_FORWARD_ONLY, rs.getType());
+            assertEquals(ResultSet.HOLD_CURSORS_OVER_COMMIT, 
rs.getHoldability());
+
+            expectSqlException(rs::moveToCurrentRow, "The result set 
concurrency is CONCUR_READ_ONLY");
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullPositional(ColumnType columnType) throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
columnType, 0, 0, false), null)) {
+            switch (columnType) {
+                case NULL:
+                    assertNull(rs.getObject(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BOOLEAN:
+                    assertFalse(rs.getBoolean(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT8:
+                    assertEquals(0, rs.getByte(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT16:
+                    assertEquals(0, rs.getShort(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT32:
+                    assertEquals(0, rs.getInt(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT64:
+                    assertEquals(0, rs.getLong(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case FLOAT:
+                    assertEquals(0, rs.getFloat(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DOUBLE:
+                    assertEquals(0, rs.getDouble(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DECIMAL:
+                    assertNull(rs.getBigDecimal(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATE:
+                    assertNull(rs.getDate(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIME:
+                    assertNull(rs.getTime(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATETIME:
+                    assertNull(rs.getTimestamp(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIMESTAMP:
+                    assertNull(rs.getTimestamp(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case UUID:
+                    assertNull(rs.getObject(1, UUID.class));
+                    assertTrue(rs.wasNull());
+                    break;
+                case STRING:
+                    assertNull(rs.getString(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BYTE_ARRAY:
+                    assertNull(rs.getBytes(1));
+                    assertTrue(rs.wasNull());
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unexpected type: " + 
columnType);
+            }
+        }
+    }
+
+    @ParameterizedTest
+    @EnumSource(names = {"PERIOD", "DURATION"}, mode = EnumSource.Mode.EXCLUDE)
+    public void wasNullNamed(ColumnType columnType) throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
columnType, 0, 0, false), null)) {
+            switch (columnType) {
+                case NULL:
+                    assertNull(rs.getObject("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BOOLEAN:
+                    assertFalse(rs.getBoolean("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT8:
+                    assertEquals(0, rs.getByte("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT16:
+                    assertEquals(0, rs.getShort("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT32:
+                    assertEquals(0, rs.getInt("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case INT64:
+                    assertEquals(0, rs.getLong("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case FLOAT:
+                    assertEquals(0, rs.getFloat("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DOUBLE:
+                    assertEquals(0, rs.getDouble("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DECIMAL:
+                    assertNull(rs.getBigDecimal("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATE:
+                    assertNull(rs.getDate("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIME:
+                    assertNull(rs.getTime("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case DATETIME:
+                    assertNull(rs.getTimestamp("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case TIMESTAMP:
+                    assertNull(rs.getTimestamp("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case UUID:
+                    assertNull(rs.getObject(1, UUID.class));
+                    assertTrue(rs.wasNull());
+                    break;
+                case STRING:
+                    assertNull(rs.getString("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                case BYTE_ARRAY:
+                    assertNull(rs.getBytes("C"));
+                    assertTrue(rs.wasNull());
+                    break;
+                default:
+                    throw new IllegalArgumentException("Unexpected type: " + 
columnType);
+            }
+        }
+    }
+
+    @Test
+    public void getUnknownColumn() throws SQLException {
+        try (ResultSet rs = createPositionedSingle(new ColumnDefinition("C", 
ColumnType.BOOLEAN, 0, 0, false), 1)) {
+
+            expectInvalidColumn(rs::getBoolean, -1);
+            expectInvalidColumn(rs::getBoolean, 2);
+            expectInvalidColumn(rs::getBoolean, "X");
+
+            expectInvalidColumn(rs::getByte, -1);
+            expectInvalidColumn(rs::getByte, 2);
+            expectInvalidColumn(rs::getByte, "X");
+
+            expectInvalidColumn(rs::getShort, -1);
+            expectInvalidColumn(rs::getShort, 2);
+            expectInvalidColumn(rs::getShort, "X");
+
+            expectInvalidColumn(rs::getInt, -1);
+            expectInvalidColumn(rs::getInt, 2);
+            expectInvalidColumn(rs::getInt, "X");
+
+            expectInvalidColumn(rs::getLong, -1);
+            expectInvalidColumn(rs::getLong, 2);
+            expectInvalidColumn(rs::getLong, "X");
+
+            expectInvalidColumn(rs::getFloat, -1);
+            expectInvalidColumn(rs::getFloat, 2);
+            expectInvalidColumn(rs::getFloat, "X");
+
+            expectInvalidColumn(rs::getDouble, -1);
+            expectInvalidColumn(rs::getDouble, 2);
+            expectInvalidColumn(rs::getDouble, "X");
+
+            expectInvalidColumn(rs::getBigDecimal, -1);
+            expectInvalidColumn(rs::getBigDecimal, 2);
+            expectInvalidColumn(rs::getBigDecimal, "X");
+
+            expectInvalidColumn(rs::getDate, -1);
+            expectInvalidColumn(rs::getDate, 2);
+            expectInvalidColumn(rs::getDate, "X");
+
+            expectInvalidColumn(rs::getTime, -1);
+            expectInvalidColumn(rs::getTime, 2);
+            expectInvalidColumn(rs::getTime, "X");
+
+            expectInvalidColumn(rs::getTimestamp, -1);
+            expectInvalidColumn(rs::getTimestamp, 2);
+            expectInvalidColumn(rs::getTimestamp, "X");
+
+            expectInvalidColumn(rs::getString, -1);
+            expectInvalidColumn(rs::getString, 2);
+            expectInvalidColumn(rs::getString, "X");
+
+            expectInvalidColumn(rs::getNString, -1);
+            expectInvalidColumn(rs::getNString, 2);
+            expectInvalidColumn(rs::getNString, "X");
+
+            expectInvalidColumn(rs::getObject, -1);
+            expectInvalidColumn(rs::getObject, 2);
+            expectInvalidColumn(rs::getObject, "X");
+
+            expectSqlException(() -> rs.getObject(-1, Integer.class), "Invalid 
column index: -1");
+            expectSqlException(() -> rs.getObject(2, Integer.class), "Invalid 
column index: 2");
+            expectSqlException(() -> rs.getObject("X", Integer.class), "Column 
not found: X");
+
+            expectSqlException(() -> rs.getObject(-1, Map.of()), "SQL 
structured type are not supported");
+            expectSqlException(() -> rs.getObject(2, Map.of()), "SQL 
structured type are not supported");
+            expectSqlException(() -> rs.getObject("X", Map.of()), "SQL 
structured type are not supported");
+        }
+    }
+
+    @Test
+    public void methodsArePositioned() throws SQLException {
+        try (ResultSet rs = createResultSet(null,
+                List.of(new ColumnDefinition("C", ColumnType.BOOLEAN, 0, 0, 
false)),
+                List.of())
+        ) {
+            expectPositioned(rs::wasNull);
+
+            expectPositioned(() -> rs.getBoolean(1));
+            expectPositioned(() -> rs.getBoolean("C"));
+
+            expectPositioned(() -> rs.getByte(1));
+            expectPositioned(() -> rs.getByte("C"));
+
+            expectPositioned(() -> rs.getShort(1));
+            expectPositioned(() -> rs.getShort("C"));
+
+            expectPositioned(() -> rs.getInt(1));
+            expectPositioned(() -> rs.getInt("C"));
+
+            expectPositioned(() -> rs.getLong(1));
+            expectPositioned(() -> rs.getLong("C"));
+
+            expectPositioned(() -> rs.getFloat(1));
+            expectPositioned(() -> rs.getFloat("C"));
+
+            expectPositioned(() -> rs.getDouble(1));
+            expectPositioned(() -> rs.getDouble("C"));
+
+            expectPositioned(() -> rs.getBigDecimal(1));
+            expectPositioned(() -> rs.getBigDecimal("C"));
+
+            expectPositioned(() -> rs.getBigDecimal(1, 2));
+            expectPositioned(() -> rs.getBigDecimal("C", 3));

Review Comment:
   ```suggestion
               //noinspection deprecation
               expectPositioned(() -> rs.getBigDecimal(1, 2));
               //noinspection deprecation
               expectPositioned(() -> rs.getBigDecimal("C", 3));
   ```



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