lowka commented on code in PR #3342:
URL: https://github.com/apache/ignite-3/pull/3342#discussion_r1512504924


##########
modules/sql-engine/src/integrationTest/java/org/apache/ignite/internal/sql/engine/ItIndexesSystemViewTest.java:
##########
@@ -0,0 +1,116 @@
+/*
+ * 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.sql.engine;
+
+import static 
org.apache.ignite.internal.catalog.descriptors.CatalogIndexStatus.AVAILABLE;
+import static 
org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Type.HASH;
+import static 
org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Type.SORTED;
+
+import org.apache.ignite.internal.sql.BaseSqlIntegrationTest;
+import org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Collation;
+import org.apache.ignite.internal.testframework.IgniteTestUtils;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+
+/** End-to-end tests to verify indexes system view. */
+public class ItIndexesSystemViewTest extends BaseSqlIntegrationTest {
+    private static final int TABLE_ID = 7;
+
+    private static final String TABLE_NAME = "TEST_TABLE";
+
+    private static final String COLUMN_NAME = "ID";

Review Comment:
   I think it is better use to obtain IDs via catalog instead of using constants
   
   > IgniteImpl ignite = CLUSTER.aliveNode();
           CatalogManager catalogManager = ignite.catalogManager();
           int version = catalogManager.latestCatalogVersion();
           Catalog catalog = catalogManager.catalog(version);
   ... 



##########
modules/sql-engine/src/integrationTest/java/org/apache/ignite/internal/sql/engine/ItIndexesSystemViewTest.java:
##########
@@ -0,0 +1,116 @@
+/*
+ * 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.sql.engine;
+
+import static 
org.apache.ignite.internal.catalog.descriptors.CatalogIndexStatus.AVAILABLE;
+import static 
org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Type.HASH;
+import static 
org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Type.SORTED;
+
+import org.apache.ignite.internal.sql.BaseSqlIntegrationTest;
+import org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Collation;
+import org.apache.ignite.internal.testframework.IgniteTestUtils;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+
+/** End-to-end tests to verify indexes system view. */
+public class ItIndexesSystemViewTest extends BaseSqlIntegrationTest {
+    private static final int TABLE_ID = 7;
+
+    private static final String TABLE_NAME = "TEST_TABLE";
+
+    private static final String COLUMN_NAME = "ID";
+
+    private static final int SCHEMA_ID = 0;
+
+    private static final String SCHEMA_NAME = "PUBLIC";
+
+    private static final int LAST_INDEX_ID = 7;
+
+    @Override
+    @BeforeAll
+    protected void beforeAll(TestInfo testInfo) {
+        super.beforeAll(testInfo);
+
+        IgniteTestUtils.await(systemViewManager().completeRegistration());
+    }
+
+    @Test
+    public void multipleIndexes() {
+        sql(String.format("CREATE TABLE %S (%s INT PRIMARY KEY);", TABLE_NAME, 
COLUMN_NAME));
+
+        String hashIndexName = "TEST_INDEX_HASH";
+        String sortedIndexName = "TEST_INDEX_SORTED";
+        String primaryKeyIndexName = TABLE_NAME + "_PK";
+
+        sql(createIndexSql("TEST_INDEX_HASH", TABLE_NAME, HASH.name(), 
COLUMN_NAME));
+        sql(createIndexSql("TEST_INDEX_SORTED", TABLE_NAME, "TREE", 
COLUMN_NAME + " DESC"));
+
+        assertQuery("SELECT * FROM SYSTEM.INDEXES").returnRowCount(3).check();
+
+        assertQuery(selectFromIndexesSystemView(primaryKeyIndexName)).returns(
+                LAST_INDEX_ID + 1,
+                primaryKeyIndexName,
+                HASH.name(),
+                TABLE_ID,
+                TABLE_NAME,
+                SCHEMA_ID,
+                SCHEMA_NAME,
+                true,
+                COLUMN_NAME,
+                AVAILABLE.name()
+        ).check();
+
+        assertQuery(selectFromIndexesSystemView("TEST_INDEX_HASH")).returns(
+                LAST_INDEX_ID + 2,
+                hashIndexName,
+                HASH.name(),
+                TABLE_ID,
+                TABLE_NAME,
+                SCHEMA_ID,
+                SCHEMA_NAME,
+                false,
+                COLUMN_NAME,
+                AVAILABLE.name()
+        ).check();
+
+        assertQuery(selectFromIndexesSystemView("TEST_INDEX_SORTED")).returns(
+                LAST_INDEX_ID + 3,
+                sortedIndexName,
+                SORTED.name(),
+                TABLE_ID,
+                TABLE_NAME,
+                SCHEMA_ID,
+                SCHEMA_NAME,
+                false,
+                COLUMN_NAME + " " + Collation.DESC_NULLS_FIRST,

Review Comment:
   I think it is better to not include NULLS  FIRST / LAST options in output, 
because they are not supported at the moment.



##########
modules/sql-engine/src/integrationTest/java/org/apache/ignite/internal/sql/engine/ItIndexesSystemViewTest.java:
##########
@@ -0,0 +1,116 @@
+/*
+ * 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.sql.engine;
+
+import static 
org.apache.ignite.internal.catalog.descriptors.CatalogIndexStatus.AVAILABLE;
+import static 
org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Type.HASH;
+import static 
org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Type.SORTED;
+
+import org.apache.ignite.internal.sql.BaseSqlIntegrationTest;
+import org.apache.ignite.internal.sql.engine.schema.IgniteIndex.Collation;
+import org.apache.ignite.internal.testframework.IgniteTestUtils;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestInfo;
+
+/** End-to-end tests to verify indexes system view. */
+public class ItIndexesSystemViewTest extends BaseSqlIntegrationTest {
+    private static final int TABLE_ID = 7;
+
+    private static final String TABLE_NAME = "TEST_TABLE";
+
+    private static final String COLUMN_NAME = "ID";
+
+    private static final int SCHEMA_ID = 0;
+
+    private static final String SCHEMA_NAME = "PUBLIC";
+
+    private static final int LAST_INDEX_ID = 7;
+
+    @Override
+    @BeforeAll
+    protected void beforeAll(TestInfo testInfo) {
+        super.beforeAll(testInfo);
+
+        IgniteTestUtils.await(systemViewManager().completeRegistration());
+    }
+
+    @Test
+    public void multipleIndexes() {
+        sql(String.format("CREATE TABLE %S (%s INT PRIMARY KEY);", TABLE_NAME, 
COLUMN_NAME));
+
+        String hashIndexName = "TEST_INDEX_HASH";
+        String sortedIndexName = "TEST_INDEX_SORTED";
+        String primaryKeyIndexName = TABLE_NAME + "_PK";
+
+        sql(createIndexSql("TEST_INDEX_HASH", TABLE_NAME, HASH.name(), 
COLUMN_NAME));
+        sql(createIndexSql("TEST_INDEX_SORTED", TABLE_NAME, "TREE", 
COLUMN_NAME + " DESC"));
+
+        assertQuery("SELECT * FROM SYSTEM.INDEXES").returnRowCount(3).check();
+
+        assertQuery(selectFromIndexesSystemView(primaryKeyIndexName)).returns(
+                LAST_INDEX_ID + 1,
+                primaryKeyIndexName,
+                HASH.name(),
+                TABLE_ID,
+                TABLE_NAME,
+                SCHEMA_ID,
+                SCHEMA_NAME,
+                true,
+                COLUMN_NAME,
+                AVAILABLE.name()
+        ).check();
+
+        assertQuery(selectFromIndexesSystemView("TEST_INDEX_HASH")).returns(
+                LAST_INDEX_ID + 2,
+                hashIndexName,
+                HASH.name(),
+                TABLE_ID,
+                TABLE_NAME,
+                SCHEMA_ID,
+                SCHEMA_NAME,
+                false,
+                COLUMN_NAME,
+                AVAILABLE.name()
+        ).check();
+
+        assertQuery(selectFromIndexesSystemView("TEST_INDEX_SORTED")).returns(

Review Comment:
   Perhaps we can add another column to this index, so it possible to see both 
ASC and DESC options.



##########
modules/catalog/src/main/java/org/apache/ignite/internal/catalog/CatalogManagerImpl.java:
##########
@@ -661,31 +672,90 @@ private SystemView<?> createSystemViewColumnsView() {
 
         return 
SystemViews.<ParentIdAwareDescriptor<CatalogTableColumnDescriptor>>clusterViewBuilder()
                 .name("SYSTEM_VIEW_COLUMNS")
-                .addColumn("VIEW_ID", NativeTypes.INT32, entry -> entry.id)
-                .addColumn("NAME", 
NativeTypes.stringOf(SYSTEM_VIEW_STRING_COLUMN_LENGTH), entry -> 
entry.descriptor.name())
-                .addColumn("TYPE", 
NativeTypes.stringOf(SYSTEM_VIEW_STRING_COLUMN_LENGTH), entry -> 
entry.descriptor.type().name())
-                .addColumn("NULLABLE", NativeTypes.BOOLEAN, entry -> 
entry.descriptor.nullable())
-                .addColumn("PRECISION", NativeTypes.INT32, entry -> 
entry.descriptor.precision())
-                .addColumn("SCALE", NativeTypes.INT32, entry -> 
entry.descriptor.scale())
-                .addColumn("LENGTH", NativeTypes.INT32, entry -> 
entry.descriptor.length())
+                .addColumn("VIEW_ID", INT32, entry -> entry.id)
+                .addColumn("NAME", stringOf(SYSTEM_VIEW_STRING_COLUMN_LENGTH), 
entry -> entry.descriptor.name())
+                .addColumn("TYPE", stringOf(SYSTEM_VIEW_STRING_COLUMN_LENGTH), 
entry -> entry.descriptor.type().name())
+                .addColumn("NULLABLE", BOOLEAN, entry -> 
entry.descriptor.nullable())
+                .addColumn("PRECISION", INT32, entry -> 
entry.descriptor.precision())
+                .addColumn("SCALE", INT32, entry -> entry.descriptor.scale())
+                .addColumn("LENGTH", INT32, entry -> entry.descriptor.length())
                 .dataProvider(viewDataPublisher)
                 .build();
     }
 
     private SystemView<?> createSystemViewZonesView() {
         return SystemViews.<CatalogZoneDescriptor>clusterViewBuilder()
                 .name("ZONES")
-                .addColumn("NAME", NativeTypes.STRING, 
CatalogZoneDescriptor::name)
-                .addColumn("PARTITIONS", NativeTypes.INT32, 
CatalogZoneDescriptor::partitions)
-                .addColumn("REPLICAS", NativeTypes.INT32, 
CatalogZoneDescriptor::replicas)
-                .addColumn("DATA_NODES_AUTO_ADJUST_SCALE_UP", 
NativeTypes.INT32, CatalogZoneDescriptor::dataNodesAutoAdjustScaleUp)
-                .addColumn("DATA_NODES_AUTO_ADJUST_SCALE_DOWN", 
NativeTypes.INT32, CatalogZoneDescriptor::dataNodesAutoAdjustScaleDown)
-                .addColumn("DATA_NODES_FILTER", NativeTypes.STRING, 
CatalogZoneDescriptor::filter)
-                .addColumn("IS_DEFAULT_ZONE", NativeTypes.BOOLEAN, 
isDefaultZone())
+                .addColumn("NAME", STRING, CatalogZoneDescriptor::name)
+                .addColumn("PARTITIONS", INT32, 
CatalogZoneDescriptor::partitions)
+                .addColumn("REPLICAS", INT32, CatalogZoneDescriptor::replicas)
+                .addColumn("DATA_NODES_AUTO_ADJUST_SCALE_UP", INT32, 
CatalogZoneDescriptor::dataNodesAutoAdjustScaleUp)
+                .addColumn("DATA_NODES_AUTO_ADJUST_SCALE_DOWN", INT32, 
CatalogZoneDescriptor::dataNodesAutoAdjustScaleDown)
+                .addColumn("DATA_NODES_FILTER", STRING, 
CatalogZoneDescriptor::filter)
+                .addColumn("IS_DEFAULT_ZONE", BOOLEAN, isDefaultZone())
                 .dataProvider(SubscriptionUtils.fromIterable(() -> 
catalog(latestCatalogVersion()).zones().iterator()))
                 .build();
     }
 
+    private SystemView<?> createSystemViewIndexesView() {
+        return SystemViews.<CatalogIndexViewDescriptor>clusterViewBuilder()
+                .name("INDEXES")
+                .addColumn("INDEX_ID", INT32, CatalogIndexViewDescriptor::id)
+                .addColumn("INDEX_NAME", STRING, 
CatalogIndexViewDescriptor::name)
+                .addColumn("TABLE_ID", INT32, 
CatalogIndexViewDescriptor::tableId)
+                .addColumn("TABLE_NAME", STRING, 
CatalogIndexViewDescriptor::tableName)
+                .addColumn("SCHEMA_ID", INT32, 
CatalogIndexViewDescriptor::schemaId)
+                .addColumn("SCHEMA_NAME", STRING, 
CatalogIndexViewDescriptor::schemaName)
+                .addColumn("TYPE", STRING, CatalogIndexViewDescriptor::type)
+                .addColumn("UNIQUE", BOOLEAN, 
CatalogIndexViewDescriptor::unique)
+                .addColumn("COLUMNS", STRING, 
CatalogIndexViewDescriptor::columnsString)
+                .addColumn("STATUS", STRING, 
CatalogIndexViewDescriptor::status)
+                .dataProvider(getIndexesDataProvider())
+                .build();
+    }
+
+    private Publisher<CatalogIndexViewDescriptor> getIndexesDataProvider() {
+        return SubscriptionUtils.fromIterable(() ->
+                catalog(latestCatalogVersion())
+                        .indexes()
+                        .stream()
+                        .filter(it -> it.status() != STOPPING)
+                        .map(this::toCatalogIndexView)
+                        .iterator()
+        );
+    }
+
+    private CatalogIndexViewDescriptor 
toCatalogIndexView(CatalogIndexDescriptor index) {
+        Catalog catalog = catalog(latestCatalogVersion());
+        CatalogTableDescriptor table = catalog.table(index.tableId());
+
+        return new CatalogIndexViewDescriptor(
+                index.id(),
+                index.name(),
+                index.indexType().name(),
+                index.tableId(),
+                table.name(),
+                table.schemaId(),
+                catalog.schema(table.schemaId()).name(),
+                index.unique(),
+                getIndexColumns(index),
+                index.status().name()
+        );
+    }
+
+    private static String getIndexColumns(CatalogIndexDescriptor 
indexDescriptor) {
+        return indexDescriptor.indexType() == CatalogIndexDescriptorType.HASH

Review Comment:
   I think it would be better to move this code that formats columns to 
CatalogIndexViewDescriptor.



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