jackye1995 commented on a change in pull request #2410:
URL: https://github.com/apache/iceberg/pull/2410#discussion_r628996025



##########
File path: flink/src/test/java/org/apache/iceberg/flink/TestChangeLogTable.java
##########
@@ -0,0 +1,302 @@
+/*
+ * 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.iceberg.flink;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import org.apache.flink.types.Row;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.iceberg.BaseTable;
+import org.apache.iceberg.CatalogProperties;
+import org.apache.iceberg.Snapshot;
+import org.apache.iceberg.Table;
+import org.apache.iceberg.TableMetadata;
+import org.apache.iceberg.TableOperations;
+import org.apache.iceberg.catalog.TableIdentifier;
+import org.apache.iceberg.data.Record;
+import org.apache.iceberg.flink.source.BoundedTableFactory;
+import org.apache.iceberg.flink.source.ChangeLogTableTestBase;
+import org.apache.iceberg.relocated.com.google.common.base.Joiner;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList;
+import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap;
+import org.apache.iceberg.relocated.com.google.common.collect.Lists;
+import org.apache.iceberg.util.StructLikeSet;
+import org.junit.After;
+import org.junit.Assert;
+import org.junit.Before;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.Parameterized;
+
+@RunWith(Parameterized.class)
+public class TestChangeLogTable extends ChangeLogTableTestBase {
+  private static final Configuration CONF = new Configuration();
+  private static final String SOURCE_TABLE = 
"default_catalog.default_database.source_change_logs";
+
+  private static final String CATALOG_NAME = "test_catalog";
+  private static final String DATABASE_NAME = "test_db";
+  private static final String TABLE_NAME = "test_table";
+  private static String warehouse;
+
+  private final boolean partitioned;
+
+  @Parameterized.Parameters(name = "PartitionedTable={0}")
+  public static Iterable<Object[]> parameters() {
+    return ImmutableList.of(
+        new Object[] {true},
+        new Object[] {false}
+    );
+  }
+
+  public TestChangeLogTable(boolean partitioned) {
+    this.partitioned = partitioned;
+  }
+
+  @BeforeClass
+  public static void createWarehouse() throws IOException {
+    File warehouseFile = TEMPORARY_FOLDER.newFolder();
+    Assert.assertTrue("The warehouse should be deleted", 
warehouseFile.delete());
+    warehouse = String.format("file:%s", warehouseFile);
+  }
+
+  @Before
+  public void before() {
+    sql("CREATE CATALOG %s WITH ('type'='iceberg', 'catalog-type'='hadoop', 
'warehouse'='%s')",
+        CATALOG_NAME, warehouse);
+    sql("USE CATALOG %s", CATALOG_NAME);
+    sql("CREATE DATABASE %s", DATABASE_NAME);
+    sql("USE %s", DATABASE_NAME);
+  }
+
+  @After
+  @Override
+  public void clean() {
+    sql("DROP TABLE IF EXISTS %s", TABLE_NAME);
+    sql("DROP DATABASE IF EXISTS %s", DATABASE_NAME);
+    sql("DROP CATALOG IF EXISTS %s", CATALOG_NAME);
+    BoundedTableFactory.clearDataSets();
+  }
+
+  @Test
+  public void testSqlChangeLogOnIdKey() throws Exception {
+    List<List<Row>> inputRowsPerCheckpoint = ImmutableList.of(
+        ImmutableList.of(
+            row("+I", 1, "aaa"),
+            row("-D", 1, "aaa"),
+            row("+I", 1, "bbb"),
+            row("+I", 2, "aaa"),
+            row("-D", 2, "aaa"),
+            row("+I", 2, "bbb")
+        ),
+        ImmutableList.of(
+            row("-U", 2, "bbb"),
+            row("+U", 2, "ccc"),
+            row("-D", 2, "ccc"),
+            row("+I", 2, "ddd")
+        ),
+        ImmutableList.of(
+            row("-D", 1, "bbb"),
+            row("+I", 1, "ccc"),
+            row("-D", 1, "ccc"),
+            row("+I", 1, "ddd")
+        )
+    );
+
+    List<List<Record>> expectedRecordsPerCheckpoint = ImmutableList.of(
+        ImmutableList.of(record(1, "bbb"), record(2, "bbb")),
+        ImmutableList.of(record(1, "bbb"), record(2, "ddd")),
+        ImmutableList.of(record(1, "ddd"), record(2, "ddd"))
+    );
+
+    testSqlChangeLog(TABLE_NAME, ImmutableList.of("id"), 
inputRowsPerCheckpoint,
+        expectedRecordsPerCheckpoint);
+  }
+
+  @Test
+  public void testChangeLogOnDataKey() throws Exception {
+    List<List<Row>> elementsPerCheckpoint = ImmutableList.of(
+        ImmutableList.of(
+            row("+I", 1, "aaa"),
+            row("-D", 1, "aaa"),
+            row("+I", 2, "bbb"),
+            row("+I", 1, "bbb"),
+            row("+I", 2, "aaa")
+        ),
+        ImmutableList.of(
+            row("-U", 2, "aaa"),
+            row("+U", 1, "ccc"),
+            row("+I", 1, "aaa")
+        ),
+        ImmutableList.of(
+            row("-D", 1, "bbb"),
+            row("+I", 2, "aaa"),
+            row("+I", 2, "ccc")
+        )
+    );
+
+    List<List<Record>> expectedRecords = ImmutableList.of(
+        ImmutableList.of(record(1, "bbb"), record(2, "aaa")),
+        ImmutableList.of(record(1, "aaa"), record(1, "bbb"), record(1, "ccc")),
+        ImmutableList.of(record(1, "aaa"), record(1, "ccc"), record(2, "aaa"), 
record(2, "ccc"))
+    );
+
+    testSqlChangeLog(TABLE_NAME, ImmutableList.of("data"), 
elementsPerCheckpoint, expectedRecords);
+  }
+
+  @Test
+  public void testChangeLogOnIdDataKey() throws Exception {
+    List<List<Row>> elementsPerCheckpoint = ImmutableList.of(
+        ImmutableList.of(
+            row("+I", 1, "aaa"),
+            row("-D", 1, "aaa"),
+            row("+I", 2, "bbb"),
+            row("+I", 1, "bbb"),
+            row("+I", 2, "aaa")
+        ),
+        ImmutableList.of(
+            row("-U", 2, "aaa"),
+            row("+U", 1, "ccc"),
+            row("+I", 1, "aaa")
+        ),
+        ImmutableList.of(
+            row("-D", 1, "bbb"),
+            row("+I", 2, "aaa")
+        )
+    );
+
+    List<List<Record>> expectedRecords = ImmutableList.of(
+        ImmutableList.of(record(1, "bbb"), record(2, "aaa"), record(2, "bbb")),
+        ImmutableList.of(record(1, "aaa"), record(1, "bbb"), record(1, "ccc"), 
record(2, "bbb")),
+        ImmutableList.of(record(1, "aaa"), record(1, "ccc"), record(2, "aaa"), 
record(2, "bbb"))
+    );
+
+    testSqlChangeLog(TABLE_NAME, ImmutableList.of("data", "id"), 
elementsPerCheckpoint, expectedRecords);
+  }
+
+  @Test
+  public void testPureInsertOnIdKey() throws Exception {

Review comment:
       why do we need an insert only test? The tests above should be able to 
convert this case. If we really want to test comprehensively, I think we should 
also have tests for insert + delete only and insert + update only.




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