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https://issues.apache.org/jira/browse/FLINK-4565?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15473685#comment-15473685
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Simone Robutti commented on FLINK-4565:
---------------------------------------
I defined this parser combinator rule ```lazy val in:PackratParser[Expression]
= term ~ "IN" ~ table ^^{
case l ~ _ ~ r => In(l,r)
}```
`In` takes an expression (containing the field of the left table to be matched
against the right table) and a Table. I need to define a parser for a Table
but I never worked with parser-combinators so I have no idea how to do that.
Any suggestion?
> 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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