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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15654209#comment-15654209
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Jark Wu commented on FLINK-4565:
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Hi, [~nvasilishin], regarding to the second problem, I just find that we only
need to add an entry of {{"in" -> classOf[In]}} into
{{FunctionCatalog.builtInFunctions}}, do not need to modify
{{ExpressionParser}}. It can fix the problem.
The SUM, AVG, COUNT have no parameters and can omit the parenthesis , but
suffixFunctionCall must have parenthesis and is varargs. So for some special
functions , we need to implement their "lazy val functions".
> 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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