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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15474327#comment-15474327
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Timo Walther commented on FLINK-4565:
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I'm very sorry. Maybe I underestimated this issue after thinking about it. It
is the first combination of expression and table which makes this issue tricky.
Yes the validation is very complicated especially because we have 2 validations
one for SQL and one for the Table API (with heavy Scala magic). If you are
still wanna do that, I can also help you in a private chat. Otherwise e.g.
FLINK-4599 would be easier. I will add the "starter" label to easier tasks.
> 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: Simone Robutti
>
> 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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