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https://issues.apache.org/jira/browse/FLINK-6992?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16060556#comment-16060556
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Fabian Hueske commented on FLINK-6992:
--------------------------------------

I don't know. As I said, the PR seems to be inactive. [~twalthr] was looking 
into that.

There are multiple ways this feature can be split up: 
- {{IN}} for a list of literals or for a subquery
- Table API and/or SQL support

Not sure what is addressed by the PR. I think the best approach is to start 
with {{IN}} support for a list of literals in SQL and later expand the Table 
API to support this as well.

> add support for IN, NOT IN in tableAPI
> --------------------------------------
>
>                 Key: FLINK-6992
>                 URL: https://issues.apache.org/jira/browse/FLINK-6992
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table API & SQL
>            Reporter: Ruidong Li
>            Assignee: Ruidong Li
>            Priority: Minor
>
> to support table.where('a in ("x", "y", "z"))



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