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https://issues.apache.org/jira/browse/FLINK-4130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15356537#comment-15356537
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Jark Wu commented on FLINK-4130:
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It seems that cody has pulled a request for this issue:
https://github.com/apache/flink/pull/2182
> CallGenerator could generate illegal code when taking no operands
> -----------------------------------------------------------------
>
> Key: FLINK-4130
> URL: https://issues.apache.org/jira/browse/FLINK-4130
> Project: Flink
> Issue Type: Bug
> Components: Table API & SQL
> Affects Versions: 1.1.0
> Reporter: Cody
> Priority: Minor
>
> In CallGenerator, when a call takes no operands, and null check is enabled,
> it will generate code like:
> boolean isNull$17 = ;
> which will fail to compile at runtime.
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