[jira] [Created] (FLINK-21848) table api -----window opening for event time。NullPointer

[Shang Yuanchun (Jira)]

wangbin created FLINK-21848:
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             Summary: table api -----window opening for event time。NullPointer
                 Key: FLINK-21848
                 URL: https://issues.apache.org/jira/browse/FLINK-21848
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
            Reporter: wangbin
         Attachments: image-2021-03-18-09-14-21-726.png, image-2021-03-18-09-14-38-073.png, image-2021-03-18-09-14-52-536.png

* According to the code of the official website, I wrote an example of window opening for event time.but nullpoint！

 * _I don't know why_
 * _!image-2021-03-18-09-14-21-726.png!_

_!image-2021-03-18-09-14-38-073.png!_

 

_!image-2021-03-18-09-14-52-536.png!_



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