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Posted to issues@hive.apache.org by "Vineet Garg (JIRA)" <ji...@apache.org> on 2018/02/15 23:32:00 UTC
[jira] [Updated] (HIVE-18724) Improve error handling for subqueries
referencing columns(correlated) of it's grand-parent query
[ https://issues.apache.org/jira/browse/HIVE-18724?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Vineet Garg updated HIVE-18724:
-------------------------------
Description:
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.
was:
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.
{format}
This is very misleading since Hive does support Nested subqueries.
> Improve error handling for subqueries referencing columns(correlated) of it's 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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