wuchong commented on a change in pull request #11837:
URL: https://github.com/apache/flink/pull/11837#discussion_r414255501



##########
File path: 
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/plan/stream/sql/TableSourceTest.scala
##########
@@ -130,6 +131,60 @@ class TableSourceTest extends TableTestBase {
     util.verifyPlan(sqlQuery)
   }
 
+
+  @Test
+  def testLegacyRowTimeTableGroupWindow(): Unit = {
+    util.tableEnv.connect(new ConnectorDescriptor("TestTableSourceWithTime", 
1, false) {
+      override protected def toConnectorProperties: JMap[String, String] = {
+        Collections.emptyMap()
+      }

Review comment:
       Introducing a generic connector descriptor is another topic, and I'm 
concerned `CustomConnectorDescriptor` is not easy-to-use enough. 
   
   Maybe we can introduce a general `TestConnectorDescriptor` in tests.




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