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https://issues.apache.org/jira/browse/HIVE-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13801780#comment-13801780
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Brock Noland commented on HIVE-784:
-----------------------------------
I understand SemanticAnalyzer is hard to unit test, but SubQueryUtils is full
of static methods that should be much easier to unit test. Just curious, is
there a reason we are not unit testing this code?
> Support uncorrelated subqueries in the WHERE clause
> ---------------------------------------------------
>
> Key: HIVE-784
> URL: https://issues.apache.org/jira/browse/HIVE-784
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Ning Zhang
> Assignee: Harish Butani
> Attachments: D13443.1.patch, D13443.2.patch, HIVE-784.1.patch.txt,
> HIVE-784.2.patch, SubQuerySpec.pdf, tpchQueriesUsingSubQueryClauses.sql
>
>
> Hive currently only support views in the FROM-clause, some Facebook use cases
> suggest that Hive should support subqueries such as those connected by
> IN/EXISTS in the WHERE-clause.
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