dawidwys commented on code in PR #25921:
URL: https://github.com/apache/flink/pull/25921#discussion_r1907090365
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flink-table/flink-table-planner/src/test/scala/org/apache/flink/table/planner/runtime/stream/sql/SourceWatermarkITCase.scala:
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@@ -305,4 +306,56 @@ class SourceWatermarkITCase extends StreamingTestBase {
assertThat(actualWatermark).isEqualTo(expectedWatermarkOutput)
assertThat(sink.getAppendResults.sorted).isEqualTo(expectedData.sorted)
}
+
+ @Test
+ def testWatermarkNotMovingBack(): Unit = {
+ val data = Seq(
+ row(1, LocalDateTime.parse("2024-01-01T00:00:00")),
+ row(3, LocalDateTime.parse("2024-01-03T00:00:00")),
+ row(2, LocalDateTime.parse("2024-01-02T00:00:00"))
+ )
+
+ val dataId = TestValuesTableFactory.registerData(data)
+
+ val ddl =
+ s"""
+ | CREATE Table VirtualTable (
+ | a INT,
+ | c TIMESTAMP(3),
+ | WATERMARK FOR c as c
+ | ) with (
+ | 'connector' = 'values',
+ | 'bounded' = 'false',
+ | 'scan.watermark.emit.strategy' = 'on-periodic',
+ | 'enable-watermark-push-down' = 'true',
+ | 'disable-lookup' = 'true',
+ | 'data-id' = '$dataId'
+ | )
+ |""".stripMargin
+
+ tEnv.executeSql(ddl)
+ tEnv.getConfig.set(CoreOptions.DEFAULT_PARALLELISM.key(), "1")
+
+ val expectedWatermarkOutput = Seq("2024-01-01T00:00", "2024-01-03T00:00",
"2024-01-03T00:00")
Review Comment:
Added a comment explaining the behaviour as well as why the test is
deterministic.
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