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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15474082#comment-15474082
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Simone Robutti commented on FLINK-4565:
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After a couple of days of work I believe this task is a bit too complex for me.
I'm struggling with the complexity of constructing the RelNode and doing the
validation. Missing an example similar enough to take inspiration, it's hard to
work on this by myself. I can imagine that this would take no more than a
couple of hours to someone with experience with Flink and Calcite and despite
all the stuff I've learnt in these days, I'm seeing no progress. My biggest
problem is that I cannot really wrap my head around many of the exception it
throws when performing construction and validation.
If there's someone patient enough to go through what I've done right now, I can
open a WIP PR or link to my repo, pointing to all the stuff that gets me
confused. Otherwise I can leave this issue to someone more skilled than me and
retry with something easier and more straightforward.
> 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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