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(registeredTimerState is already cleanup because line#201), the
nextLeftIndexState will be stored forever because cleanup trigger have been
deleted.
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