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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15690440#comment-15690440
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Fabian Hueske commented on FLINK-4565:
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Hi [~nvasilishin], sorry for the late reply.
I would suggest to open a pull request for the first two cases ({{IN
(list-of-literals)}}) and address the {{IN (table)}} case later. Smaller pull
requests are easier to handle and allow for faster review cycles.
The {{IN (table)}} case is also a bit more complex because we need to think
about the API, i.e., how to integrate the {{table: Table}} into the expressions
of {{where()}}.
> 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
> Assignee: Nikolay Vasilishin
>
> 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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