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https://issues.apache.org/jira/browse/HIVE-20262?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16561281#comment-16561281
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Hive QA commented on HIVE-20262:
--------------------------------
Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12933527/HIVE-20262.2.patch
{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.
{color:green}SUCCESS:{color} +1 due to 14816 tests passed
Test results:
https://builds.apache.org/job/PreCommit-HIVE-Build/12935/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/12935/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-12935/
Messages:
{noformat}
Executing org.apache.hive.ptest.execution.TestCheckPhase
Executing org.apache.hive.ptest.execution.PrepPhase
Executing org.apache.hive.ptest.execution.YetusPhase
Executing org.apache.hive.ptest.execution.ExecutionPhase
Executing org.apache.hive.ptest.execution.ReportingPhase
{noformat}
This message is automatically generated.
ATTACHMENT ID: 12933527 - PreCommit-HIVE-Build
> Implement stats annotation rule for the UDTFOperator
> ----------------------------------------------------
>
> Key: HIVE-20262
> URL: https://issues.apache.org/jira/browse/HIVE-20262
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Reporter: George Pachitariu
> Assignee: George Pachitariu
> Priority: Minor
> Attachments: HIVE-20262.1.patch, HIVE-20262.2.patch, HIVE-20262.patch
>
>
> User Defined Table Functions (UDTFs) change the number of rows of the output.
> A common UDTF is the explode() method that creates a row for each element for
> each array in the input column.
>
> Right now, the number of output rows is equal to the number of input rows.
> But if the average number of output rows is bigger than 1, the resulting
> number of rows is underestimated in the execution plan.
>
> Implement a rule that can have a factor X as a parameter and for each UDTF
> function predict that:
>
> {code:java}
> number of output rows = X * number of input rows{code}
>
>
>
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