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https://issues.apache.org/jira/browse/HIVE-783?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12896331#action_12896331
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Adam Kramer commented on HIVE-783:
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Also fails: a JOIN b ON (a.key < b.key), for a perhaps unrelated reason.
> Implement disjunctive JOINs
> ----------------------------
>
> Key: HIVE-783
> URL: https://issues.apache.org/jira/browse/HIVE-783
> Project: Hadoop Hive
> Issue Type: New Feature
> Reporter: Adam Kramer
>
> Currently, Hive does not allow disjunctive joins. For example:
> SELECT ...
> FROM a
> JOIN b ON (a.key1=b.key1 OR a.key1=b.key2)
> ...currently fails. The current workaround is to join on each, UNION ALL
> them, and then somehow figure out a way to remove any duplicates (wher
> b.key1=b.key2 and there's a corresponding a.key1)...but this involves many
> passes through the same data.
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