[GitHub] [flink] wuchong commented on a change in pull request #11021: [FLINK-15546][table-planner-blink] Fix obscure error message from Sca…

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wuchong commented on a change in pull request #11021: [FLINK-15546][table-planner-blink] Fix obscure error message from Sca…
URL: https://github.com/apache/flink/pull/11021#discussion_r376230408
 
 

 ##########
 File path: flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/expressions/RowTypeTest.scala
 ##########
 @@ -129,4 +128,17 @@ class RowTypeTest extends RowTypeTestBase {
       "null"
     )
   }
+
+  @Test
+  def testUnsupportedCast(): Unit = {
+    expectedException.expect(classOf[ValidationException])
+    expectedException.expectMessage(
+      "Unsupported cast from Row(f0: String, f1: Boolean) to Long")
+
+    testTableApi(
+      'f5.cast(DataTypes.BIGINT()),
 
 Review comment:
   This test case can't reproduce the problem which reported by this issue. You should add a test case which cast a ROW to another ROW, e.g. 
   
   ```scala
   testSqlApi("CAST(f5 AS ROW<f0 INT, f1 STRING>)", "")
   ```

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