wuchong commented on a change in pull request #10989: 
[FLINK-15840][table-planner-blink] ClassCastException is thrown when use 
tEnv.from for temp/catalog table
URL: https://github.com/apache/flink/pull/10989#discussion_r373846595
 
 

 ##########
 File path: 
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/plan/batch/sql/TableScanTest.scala
 ##########
 @@ -68,12 +70,15 @@ class TableScanTest extends TableTestBase {
          |  'is-bounded' = 'true'
          |)
        """.stripMargin)
-    util.verifyPlan("SELECT * FROM t1")
   }
 
-
   @Test
-  def testDDLWithWatermarkComputedColumn(): Unit = {
+  def testDDLWithComputedColumn(): Unit = {
+    prepareComputedColumnDDL()
+    util.verifyPlan("SELECT * FROM t1")
+  }
+
+  private def prepareWatermarkDDL(): Unit = {
 
 Review comment:
   Can we move the `prepareWatermarkDDL` and `prepareComputedColumnDDL` to the 
before stage and give the tables a more readable name, e.g. 
`computed_column_tbl`, `watermark_tbl`? So that the tests doens't need to 
invoke these methods. 

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