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https://issues.apache.org/jira/browse/HIVE-5921?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13839957#comment-13839957
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Hive QA commented on HIVE-5921:
-------------------------------
{color:green}Overall{color}: +1 all checks pass
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12617115/HIVE-5921.4.patch
{color:green}SUCCESS:{color} +1 4457 tests passed
Test results:
http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/528/testReport
Console output:
http://bigtop01.cloudera.org:8080/job/PreCommit-HIVE-Build/528/console
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12617115
> 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, HIVE-5921.3.patch,
> HIVE-5921.4.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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