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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12640) Allow StatsOptimizer to optimize the query for Constant GroupBy keys
Date Tue, 12 Jan 2016 11:32:39 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12640?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15093766#comment-15093766
] 

Hive QA commented on HIVE-12640:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12781666/HIVE-12640.3.patch

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

{color:red}ERROR:{color} -1 due to 11 failed/errored test(s), 9978 tests executed
*Failed tests:*
{noformat}
TestHWISessionManager - did not produce a TEST-*.xml file
TestMiniTezCliDriver-vectorized_parquet.q-orc_merge6.q-vector_outer_join0.q-and-12-more -
did not produce a TEST-*.xml file
TestSparkCliDriver-timestamp_lazy.q-bucketsortoptimize_insert_4.q-date_udf.q-and-12-more -
did not produce a TEST-*.xml file
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_metadata_only_queries
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver_tez_union
org.apache.hadoop.hive.cli.TestNegativeCliDriver.testNegativeCliDriver_authorization_uri_import
org.apache.hadoop.hive.cli.TestSparkCliDriver.testCliDriver_metadata_only_queries
org.apache.hadoop.hive.ql.exec.spark.session.TestSparkSessionManagerImpl.testMultiSessionMultipleUse
org.apache.hadoop.hive.ql.exec.spark.session.TestSparkSessionManagerImpl.testSingleSessionMultipleUse
org.apache.hive.jdbc.TestMultiSessionsHS2WithLocalClusterSpark.testSparkQuery
org.apache.hive.jdbc.TestSSL.testSSLVersion
{noformat}

Test results: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/6598/testReport
Console output: http://ec2-174-129-184-35.compute-1.amazonaws.com/jenkins/job/PreCommit-HIVE-TRUNK-Build/6598/console
Test logs: http://ec2-174-129-184-35.compute-1.amazonaws.com/logs/PreCommit-HIVE-TRUNK-Build-6598/

Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
Tests exited with: TestsFailedException: 11 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12781666 - PreCommit-HIVE-TRUNK-Build

> Allow StatsOptimizer to optimize the query for Constant GroupBy keys 
> ---------------------------------------------------------------------
>
>                 Key: HIVE-12640
>                 URL: https://issues.apache.org/jira/browse/HIVE-12640
>             Project: Hive
>          Issue Type: Bug
>            Reporter: Hari Sankar Sivarama Subramaniyan
>            Assignee: Hari Sankar Sivarama Subramaniyan
>         Attachments: HIVE-12640.1.patch, HIVE-12640.2.patch, HIVE-12640.3.patch
>
>
> {code}
> hive> select count('1') from src group by '1';
> {code}
> In the above query, while performing StatsOptimizer optimization we can safely ignore
the group by on the constant key '1' since the above query will return the same result as
"select count('1') from src".
> Exception:
> If src is empty, according to the SQL standard,
> {code}
>  select count('1') from src group by '1'
> {code}
> and
> {code}
>  select count('1') from src
> {code}
> should produce 1 and 0 rows respectively.



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