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https://issues.apache.org/jira/browse/FLINK-6817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16048931#comment-16048931
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ASF GitHub Bot commented on FLINK-6817:
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Github user wuchong commented on the issue:
https://github.com/apache/flink/pull/4104
Yes, it is cherrypicked from master. The Travis CI looks good, the failed
build seems nothing to do with this commit, so I will merge it.
> Fix NPE when preceding is not set in OVER window
> ------------------------------------------------
>
> Key: FLINK-6817
> URL: https://issues.apache.org/jira/browse/FLINK-6817
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Reporter: Jark Wu
> Assignee: Jark Wu
> Priority: Minor
> Fix For: 1.4.0
>
>
> When preceding is not set in over window , a NPE will be thrown:
> {code}
> val result = table
> .window(Over orderBy 'rowtime as 'w)
> .select('c, 'a.count over 'w)
> {code}
> {code}
> java.lang.NullPointerException
> at org.apache.flink.table.api.OverWindowWithOrderBy.as(windows.scala:97)
> {code}
> Preceding must be set in OVER window, so should throw a more explicit
> exception not a NPE
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