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From "Hive QA (JIRA)" <>
Subject [jira] [Commented] (HIVE-17493) Improve PKFK cardinality estimation in Physical planning
Date Sat, 09 Sep 2017 12:22:02 GMT


Hive QA commented on HIVE-17493:

Here are the results of testing the latest attachment:

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

{color:red}ERROR:{color} -1 due to 7 failed/errored test(s), 11033 tests executed
*Failed tests:*
TestAccumuloCliDriver - did not produce a TEST-*.xml file (likely timed out) (batchId=230)
TestDummy - did not produce a TEST-*.xml file (likely timed out) (batchId=230)
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver[partition_wise_fileformat6] (batchId=7)
org.apache.hadoop.hive.cli.TestMiniLlapCliDriver.testCliDriver[unionDistinct_1] (batchId=143)
org.apache.hadoop.hive.cli.TestPerfCliDriver.testCliDriver[query14] (batchId=234)
org.apache.hadoop.hive.cli.TestPerfCliDriver.testCliDriver[query23] (batchId=234)

Test results:
Console output:
Test logs:

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: 7 tests failed

This message is automatically generated.

ATTACHMENT ID: 12886201 - PreCommit-HIVE-Build

> Improve PKFK cardinality estimation in Physical planning
> --------------------------------------------------------
>                 Key: HIVE-17493
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Planning
>            Reporter: Vineet Garg
>            Assignee: Vineet Garg
>         Attachments: HIVE-17493.1.patch
> Cardinality estimation of a join, after PK-FK relation has been ascertained, could be
improved if parent of the join operator is LEFT outer or RIGHT outer join.
> Currently estimation is done by estimating reduction of rows occurred on PK side, then
multiplying the reduction to FK side row count. This estimation of reduction currently doesn't
distinguish b/w INNER or OUTER joins. This could be improved to handle outer joins better.
> TPC-DS query45 is impacted by this.

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