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https://issues.apache.org/jira/browse/HIVE-801?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12839052#action_12839052
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Adam Kramer commented on HIVE-801:
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Also note that the true utility of this is syntax like
WHERE a.foo IN (b.*)
...for instances where b has many many columns and it is messy to articulate
them. I'm thinking about a current table I have with 800 columns...is there a
limit on the character-wise length of a query?
> row-wise IN would be useful
> ---------------------------
>
> Key: HIVE-801
> URL: https://issues.apache.org/jira/browse/HIVE-801
> Project: Hadoop Hive
> Issue Type: New Feature
> Reporter: Adam Kramer
>
> SELECT * FROM tablename t
> WHERE IN(12345,key1,key2,key3);
> ...IN would operate on a given row, and return True when the first argument
> equaled at least one of the other arguments. So here IN would return true if
> 12345=key1 OR 12345=key2 OR 12345=key3 (but wouldn't test the latter two if
> the first matched).
> This would also help with https://issues.apache.org/jira/browse/HIVE-783, if
> IN were implemented in a manner that allows it to be used in an ON clause.
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