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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15469402#comment-15469402
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Jark Wu commented on FLINK-4565:
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I think what is confusing [~chobeat] is what's "IN" 's counterpart in DataSet
transformation, right ? Maybe we can use broadcast variables [1] to support
this feature. In addition, [FLINK-4541] may be could implemented together.
[1]
https://ci.apache.org/projects/flink/flink-docs-master/dev/batch/index.html#broadcast-variables
> Support for SQL IN operator
> ---------------------------
>
> Key: FLINK-4565
> URL: https://issues.apache.org/jira/browse/FLINK-4565
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Timo Walther
>
> It seems that Flink SQL supports the uncorrelated sub-query IN operator. But
> it should also be available in the Table API and tested.
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