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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15649700#comment-15649700
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Jark Wu commented on FLINK-4565:
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Hi [~nvasilishin] ,
1. Yes, the HashSet should be reused. You can put the code of HashSet
initialization into {{reusableMemberStatements}} and
{{reusableInitStatements}}. They will be placed in the member area and
constructor of the Function.
2. Could removing {{not(IN)}} from {{functionIdent}} in {{ExpressionParser}}
fix this problem ?
> 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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