libenchao commented on a change in pull request #13427:
URL: https://github.com/apache/flink/pull/13427#discussion_r491674078



##########
File path: 
flink-table/flink-table-planner-blink/src/test/scala/org/apache/flink/table/planner/runtime/stream/sql/WindowAggregateITCase.scala
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@@ -347,6 +347,83 @@ class WindowAggregateITCase(mode: StateBackendMode)
     assertEquals(expected.sorted, sink.getAppendResults.sorted)
   }
 
+  @Test
+  def testEventTimeTumblingWindowWithOffset(): Unit = {
+    val stream = failingDataSource(data)
+      .assignTimestampsAndWatermarks(
+        new TimestampAndWatermarkWithOffset
+          [(Long, Int, Double, Float, BigDecimal, String, String)](10L))
+    val table = stream.toTable(tEnv,
+      'rowtime.rowtime, 'int, 'double, 'float, 'bigdec, 'string, 'name)
+    tEnv.registerTable("T1", table)
+
+    val sql =
+      """
+        |SELECT
+        |  `string`,
+        |  TUMBLE_START(rowtime, INTERVAL '0.005' SECOND, TIME '00:00:00.003'),

Review comment:
       The `offset` parameter type is `TIME` in Calcite by default. Then we 
cannot support offsets larger than one day? E.g., we want to have a 1 week 
tumble window from Monday to Sunday, then we need `TUMBLE(ts, INTERVAL 7 DAY, 
INTERVAL 3 DAY)`, current implementation cannot do this.




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