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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-15234) Semijoin cardinality estimation can be improved
Date Sat, 19 Nov 2016 07:45:58 GMT

    [ https://issues.apache.org/jira/browse/HIVE-15234?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15678803#comment-15678803
] 

Hive QA commented on HIVE-15234:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12839638/HIVE-15234.1.patch

{color:red}ERROR:{color} -1 due to no test(s) being added or modified.

{color:red}ERROR:{color} -1 due to 9 failed/errored test(s), 10713 tests executed
*Failed tests:*
{noformat}
TestSparkCliDriver - did not produce a TEST-*.xml file (likely timed out) (batchId=118)
	[stats12.q,groupby4.q,union_top_level.q,groupby10.q,subquery_in.q,mapjoin_filter_on_outerjoin.q,auto_sortmerge_join_4.q,limit_partition_metadataonly.q,load_dyn_part4.q,union3.q,groupby_multi_single_reducer.q,smb_mapjoin_14.q,groupby3_noskew_multi_distinct.q,stats18.q,union_remove_21.q]
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[cbo_rp_subq_exists] (batchId=54)
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver[transform_ppr2] (batchId=133)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[cbo_rp_semijoin] (batchId=137)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[cbo_rp_subq_in] (batchId=137)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[join_acid_non_acid] (batchId=150)
org.apache.hadoop.hive.cli.TestMiniLlapLocalCliDriver.testCliDriver[union_fast_stats] (batchId=145)
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver[explainanalyze_2] (batchId=91)
org.apache.hadoop.hive.cli.TestMiniTezCliDriver.testCliDriver[explainanalyze_4] (batchId=91)
{noformat}

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/2210/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/2210/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-2210/

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: 9 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12839638 - PreCommit-HIVE-Build

> Semijoin cardinality estimation can be improved
> -----------------------------------------------
>
>                 Key: HIVE-15234
>                 URL: https://issues.apache.org/jira/browse/HIVE-15234
>             Project: Hive
>          Issue Type: Bug
>          Components: CBO, Logical Optimizer
>    Affects Versions: 2.0.0, 2.1.0
>            Reporter: Ashutosh Chauhan
>            Assignee: Ashutosh Chauhan
>         Attachments: HIVE-15234.1.patch, HIVE-15234.patch
>
>
> Currently calcite optimization rules rely on (Hive)SemiJoin to represent semi join node,
whereas Stats estimate use {{leftSemiJoin}} field of Join to estimate stats. As a result semi-join
specific stats calculation logic is never hit since at plan generation time HiveSemiJoin is
created and leftSemiJoin field of Join is never set.



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