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https://issues.apache.org/jira/browse/HIVE-18724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg updated HIVE-18724:
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Summary: Improve error handling for subqueries referencing
columns(correlated) of its grand-parent query (was: Improve error handling for
subqueries referencing columns(correlated) of it's grand-parent query)
> Improve error handling for subqueries referencing columns(correlated) of its
> grand-parent query
> -----------------------------------------------------------------------------------------------
>
> Key: HIVE-18724
> URL: https://issues.apache.org/jira/browse/HIVE-18724
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Vineet Garg
> Priority: Major
>
> Currently Hive doesn't allow correlated subqueries which refer to columns of
> grand parent query e.g.
> {code:sql}
> select t1.a from t t1 where t1.b IN (select t2.c from t t2 where t2.a IN
> (select max(t3.b) from t t3, t t4 where t3.a=t2.a and t3.b=t1.b))
> {code}
> In this example inner most query has column reference {{t3.b=t1.b}} where
> {{t1.b}} references outer most query.
> The error which Hive compiler throw is
> {noformat}
> FAILED: SemanticException Line 0:-1 Unsupported SubQuery Expression 'a':
> Nested SubQuery expressions are not supported.
> {noformat}
> This is very misleading since Hive does support Nested subqueries.
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