pnowojski commented on a change in pull request #18420:
URL: https://github.com/apache/flink/pull/18420#discussion_r788661707
##########
File path:
flink-tests/src/test/java/org/apache/flink/test/streaming/runtime/TimestampITCase.java
##########
@@ -159,6 +160,28 @@ public void testWatermarkPropagation() throws Exception {
}
}
+ @Test
+ public void testSelfUnionWatermark() throws Exception {
+ StreamExecutionEnvironment env =
StreamExecutionEnvironment.getExecutionEnvironment();
+ env.setParallelism(1);
+ DataStream<Integer> dataStream1 = env.fromElements(1, 2,
3).setParallelism(1);
+
+ dataStream1
+ .union(dataStream1)
+ .addSink(
+ new DiscardingSink<Integer>() {
+ @Override
+ public void writeWatermark(
+
org.apache.flink.api.common.eventtime.Watermark watermark)
+ throws Exception {
+ System.out.println(watermark);
+ }
+ });
+ // or use .addSink(new DiscardingSink<>()); and debug to check that
the writeWatermark() on
Review comment:
Yes, I noticed it just after publishing the PR and it's already fixed.
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