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https://issues.apache.org/jira/browse/FLINK-8617?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16358470#comment-16358470
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ASF GitHub Bot commented on FLINK-8617:
---------------------------------------

Github user Xpray commented on the issue:

    https://github.com/apache/flink/pull/5438
  
    I've removed the ITCase and add some tests to 
```org.apache.flink.table.expressions.MapTypeTest ```


> Fix code generation bug while accessing Map type
> ------------------------------------------------
>
>                 Key: FLINK-8617
>                 URL: https://issues.apache.org/jira/browse/FLINK-8617
>             Project: Flink
>          Issue Type: Bug
>          Components: Table API & SQL
>            Reporter: Ruidong Li
>            Assignee: Ruidong Li
>            Priority: Major
>
> There's a code generation bug in {code}ScalarOperatos.generateMapGet{code}.
> And there's two more bugs found in {code}ScalarOperators.generateIsNull{code} 
> and {code}ScalarOperators.generateIsNotNull{code}



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