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

["Flink Jira Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-21278?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Flink Jira Bot updated FLINK-21278:
-----------------------------------
      Labels: auto-deprioritized-critical auto-deprioritized-major pull-request-available  (was: auto-deprioritized-critical pull-request-available stale-major)
    Priority: Minor  (was: Major)

This issue was labeled "stale-major" 7 ago and has not received any updates so it is being deprioritized. If this ticket is actually Major, please raise the priority and ask a committer to assign you the issue or revive the public discussion.


> 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
>            Priority: Minor
>              Labels: auto-deprioritized-critical, auto-deprioritized-major, pull-request-available
>
> 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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