jelly-1203 commented on a change in pull request #18017:
URL: https://github.com/apache/flink/pull/18017#discussion_r769618300



##########
File path: 
flink-table/flink-table-planner/src/test/java/org/apache/flink/table/planner/operations/MergeTableLikeUtilTest.java
##########
@@ -126,6 +126,72 @@ public void mergeWithIncludeFailsOnDuplicateColumn() {
                 null);
     }
 
+    @Test
+    public void mergeWithIncludeFailsOnDuplicateRegularColumn() {
+        TableSchema sourceSchema =
+                TableSchema.builder().add(TableColumn.physical("one", 
DataTypes.INT())).build();
+
+        List<SqlNode> derivedColumns =
+                Arrays.asList(
+                        regularColumn("two", DataTypes.INT()),
+                        regularColumn("two", DataTypes.INT()),
+                        regularColumn("four", DataTypes.STRING()));
+
+        thrown.expect(ValidationException.class);
+        thrown.expectMessage("A regular Column named 'two' already exists in 
the table.");
+        util.mergeTables(
+                getDefaultMergingStrategies(),
+                sourceSchema,
+                derivedColumns,
+                Collections.emptyList(),
+                null);
+    }
+
+    @Test
+    public void 
mergeWithIncludeFailsOnDuplicateRegularColumnAndComputeColumn() {
+        TableSchema sourceSchema =
+                TableSchema.builder().add(TableColumn.physical("one", 
DataTypes.INT())).build();
+
+        List<SqlNode> derivedColumns =
+                Arrays.asList(
+                        regularColumn("two", DataTypes.INT()),
+                        computedColumn("three", plus("two", "3")),
+                        regularColumn("three", DataTypes.INT()),
+                        regularColumn("four", DataTypes.STRING()));
+
+        thrown.expect(ValidationException.class);
+        thrown.expectMessage("A column named 'three' already exists in the 
table.");
+        util.mergeTables(
+                getDefaultMergingStrategies(),
+                sourceSchema,
+                derivedColumns,
+                Collections.emptyList(),
+                null);
+    }
+
+    @Test
+    public void 
mergeWithIncludeFailsOnDuplicateRegularColumnAndMetadataColumn() {
+        TableSchema sourceSchema =
+                TableSchema.builder().add(TableColumn.physical("one", 
DataTypes.INT())).build();
+
+        List<SqlNode> derivedColumns =
+                Arrays.asList(
+                        metadataColumn("two", DataTypes.INT(), true),
+                        computedColumn("three", plus("two", "3")),
+                        regularColumn("two", DataTypes.INT()),
+                        regularColumn("four", DataTypes.STRING()));
+
+        thrown.expect(ValidationException.class);
+        thrown.expectMessage(

Review comment:
       > Contributor
   
   Ok, I'll return this error message more explicitly




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