zicat commented on a change in pull request #15247:
URL: https://github.com/apache/flink/pull/15247#discussion_r603744434
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File path:
flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/operators/join/temporal/TemporalRowTimeJoinOperator.java
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@@ -209,6 +209,7 @@ public void onEventTime(InternalTimer<Object,
VoidNamespace> timer) throws Excep
registerProcessingCleanupTimer();
} else {
cleanupLastTimer();
+ nextLeftIndex.clear();
Review comment:
When the program is going into line#211, that means leftState is empty
and rightState is empty, so cleanupLastTimer() is to delete the cleanup trigger
for this key. At this time, nextLeftIndexState is not empty(registeredTimer is
empty because line#201), the nextLeftIndexState will be stored forever because
clean update trigger have been deleted.
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