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https://issues.apache.org/jira/browse/HIVE-784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13614982#comment-13614982
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Sun Rui commented on HIVE-784:
------------------------------
Guido, you may try project-panthera-ase@github, which is an open source effort
for HIVE-3472. It can support correlated/un-correlated subqueries and selection
from multiple tables without any join operator now. Instead of directly
modifying the HiveQL grammar and query processor to support subqueries, the
project incorporates a PL/SQL parser for SQL input and performs semantically
identical transformation on the PL/SQL parser output for execution by the query
processor.
> 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: Ning Zhang
>
> 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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