[jira] [Created] (FLINK-21278) NullpointExecption error is reported when using the evictor method to filter the data before the window calculation

Thu, 04 Feb 2021 01:03:04 -0800 

HunterHunter created FLINK-21278:
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             Summary: NullpointExecption error is reported when using the 
evictor method to filter the data before the window calculation
                 Key: FLINK-21278
                 URL: https://issues.apache.org/jira/browse/FLINK-21278
             Project: Flink
          Issue Type: Bug
          Components: API / DataStream
    Affects Versions: 1.12.1
            Reporter: HunterHunter


When I use evictor() method to filter the data before a window is triggered, if 
there is no data that meets the conditions, a nullpointExecption error will be 
reported.

This problem occurs in the ReduceApplyWindowFunction.apply method.

So I think if there is no data to calculate whether it can not trigger the 
calculation, or judge whether it is null before transmitting the calculation 
result



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