tsreaper commented on a change in pull request #17845:
URL: https://github.com/apache/flink/pull/17845#discussion_r756531593



##########
File path: 
flink-table/flink-table-planner/src/test/scala/org/apache/flink/table/planner/plan/stream/sql/join/LookupJoinTest.scala
##########
@@ -525,7 +525,21 @@ class LookupJoinTest(legacyTableSource: Boolean) extends 
TableTestBase with Seri
     verifyTranslationSuccess(sql)
   }
 
-  // 
==========================================================================================
+  @Test
+  def testJoinTemporalTableWithCTE(): Unit = {
+    val sql =
+      """
+        |WITH MyLookupTable AS (SELECT * FROM MyTable),
+        |OtherLookupTable AS (SELECT * FROM LookupTable)
+        |SELECT MyLookupTable.b FROM MyLookupTable
+        |JOIN OtherLookupTable FOR SYSTEM_TIME AS OF MyLookupTable.proctime AS 
D
+        |ON MyLookupTable.a = D.id AND D.age = 10
+      """.stripMargin
+
+    verifyTranslationSuccess(sql)

Review comment:
       @YuvalItzchakov I can reproduce the `NullPointerException` with 
`util.verifyExecPlan`. Maybe you forget to revert the changes before testing.
   
   ```suggestion
       util.verifyExecPlan(sql)
   ```




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