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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-18724) Improve error handling for subqueries referencing columns(correlated) of its grand-parent query
Date Fri, 07 Sep 2018 00:24:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-18724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16606563#comment-16606563
] 

Hive QA commented on HIVE-18724:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12938685/HIVE-18724.01.patch

{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 2 failed/errored test(s), 14929 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[allcolref_in_udf] (batchId=56)
org.apache.hive.service.auth.TestCustomAuthentication.org.apache.hive.service.auth.TestCustomAuthentication
(batchId=247)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/13632/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/13632/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-13632/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 2 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12938685 - PreCommit-HIVE-Build

> 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
>            Assignee: Igor Kryvenko
>            Priority: Major
>         Attachments: HIVE-18724.01.patch
>
>
> 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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