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From "Simone Robutti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-4565) Support for SQL IN operator
Date Thu, 08 Sep 2016 14:58:20 GMT

    [ https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15474082#comment-15474082
] 

Simone Robutti commented on FLINK-4565:
---------------------------------------

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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