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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15940716#comment-15940716
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ASF GitHub Bot commented on FLINK-4565:
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Github user DmytroShkvyra commented on the issue:
https://github.com/apache/flink/pull/3502
@twalthr I have tried run `SubQueryRemoveRule` (register it in
`FlinkRulesSets`) and so on but it have not called from Flink. I have looked
thru Calcite docs and they said that calcite rules called accordingly signature
of their constructors. So we should register it in `FlinkRulesSets.scala`. But
scala has unpleasant thing - erasure. And I suspect it is root cause of it.
P.S. Sometime I'm going crazy about travis build timeouts :-(
> 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: Dmytro Shkvyra
>
> 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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