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https://issues.apache.org/jira/browse/HIVE-15673?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15976128#comment-15976128
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Lefty Leverenz commented on HIVE-15673:
---------------------------------------

Should this (and the original limitation) be documented in the wiki?  If so, 
where does it belong?

* [WHERE Clause | 
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select#LanguageManualSelect-WHEREClause]
* [Subqueries in the WHERE Clause | 
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+SubQueries#LanguageManualSubQueries-SubqueriesintheWHEREClause]
* [Logical Operators | 
https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-LogicalOperators]

> Allow multiple queries with disjunction
> ---------------------------------------
>
>                 Key: HIVE-15673
>                 URL: https://issues.apache.org/jira/browse/HIVE-15673
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>             Fix For: 3.0.0
>
>         Attachments: HIVE-15673.1.patch, HIVE-15673.2.patch, 
> HIVE-15673.3.patch, HIVE-15673.4.patch, HIVE-15673.5.patch, HIVE-15673.6.patch
>
>
> HIVE currently doesn't allow multiple subqueries with {{OR}} since calcite 
> has a bug in determining logic for OR expression. See [CALCITE-1546 
> |https://issues.apache.org/jira/browse/CALCITE-1546].
> Once calcite is released containing fix for the bug HIVE will need to lift 
> the restriction and add tests cases



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