[jira] [Created] (FLINK-4993) Don't Allow Trigger.onMerge() to return TriggerResult

[Shang Yuanchun (Jira)]

Aljoscha Krettek created FLINK-4993:
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             Summary: Don't Allow Trigger.onMerge() to return TriggerResult
                 Key: FLINK-4993
                 URL: https://issues.apache.org/jira/browse/FLINK-4993
             Project: Flink
          Issue Type: Sub-task
          Components: Streaming
            Reporter: Aljoscha Krettek
            Assignee: Aljoscha Krettek


Allowing {{Trigger.onMerge()}} to return a {{TriggerResult}} is not necessary since an {{onMerge()}} call will always be followed by an {{onElement()}} call when adding the element that caused the merging to the merged window. Having this complicates the internal logic of the {{WindowOperator}} and makes writing Triggers more confusing than it has to be.



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