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From "Hive QA (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-5921) Better heuristics for worst case statistics estimates for join, limit and filter operator
Date Wed, 04 Dec 2013 03:11:36 GMT

    [ https://issues.apache.org/jira/browse/HIVE-5921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13838556#comment-13838556
] 

Hive QA commented on HIVE-5921:
-------------------------------



{color:red}Overall{color}: -1 at least one tests failed

Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12616903/HIVE-5921.2.patch

{color:red}ERROR:{color} -1 due to 2 failed/errored test(s), 4453 tests executed
*Failed tests:*
{noformat}
org.apache.hadoop.hive.cli.TestCliDriver.testCliDriver_dynamic_partition_skip_default
org.apache.hadoop.hive.cli.TestMinimrCliDriver.testCliDriver_bucket_num_reducers
{noformat}

Test results: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/506/testReport
Console output: http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/506/console

Messages:
{noformat}
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: 2 tests failed
{noformat}

This message is automatically generated.

ATTACHMENT ID: 12616903

> Better heuristics for worst case statistics estimates for join, limit and filter operator
> -----------------------------------------------------------------------------------------
>
>                 Key: HIVE-5921
>                 URL: https://issues.apache.org/jira/browse/HIVE-5921
>             Project: Hive
>          Issue Type: Sub-task
>          Components: Query Processor, Statistics
>    Affects Versions: 0.13.0
>            Reporter: Prasanth J
>            Assignee: Prasanth J
>             Fix For: 0.13.0
>
>         Attachments: HIVE-5921.1.patch, HIVE-5921.2.patch
>
>
> This is a subtask of HIVE-5369. In worst case (i.e; absence of column statistics) HIVE-5849
improved the basic statistics with heuristics. But the heuristics failed to provide better
estimates in few cases. For example: FILTER operator heuristics did not take into account
the number of predicates and if the predicate contains partition column. Also, JOIN estimates
were too aggressive and was not user configurable.



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