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From "Hive QA (Jira)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-22893) Enhance data size estimation for fields computed by UDFs
Date Tue, 25 Feb 2020 00:45:00 GMT

    [ https://issues.apache.org/jira/browse/HIVE-22893?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17044005#comment-17044005
] 

Hive QA commented on HIVE-22893:
--------------------------------



Here are the results of testing the latest attachment:
https://issues.apache.org/jira/secure/attachment/12994319/HIVE-22893.12.patch

{color:green}SUCCESS:{color} +1 due to 1 test(s) being added or modified.

{color:green}SUCCESS:{color} +1 due to 18057 tests passed

Test results: https://builds.apache.org/job/PreCommit-HIVE-Build/20808/testReport
Console output: https://builds.apache.org/job/PreCommit-HIVE-Build/20808/console
Test logs: http://104.198.109.242/logs/PreCommit-HIVE-Build-20808/

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: 12994319 - PreCommit-HIVE-Build

> Enhance data size estimation for fields computed by UDFs
> --------------------------------------------------------
>
>                 Key: HIVE-22893
>                 URL: https://issues.apache.org/jira/browse/HIVE-22893
>             Project: Hive
>          Issue Type: Improvement
>          Components: Statistics
>            Reporter: Zoltan Haindrich
>            Assignee: Zoltan Haindrich
>            Priority: Major
>              Labels: pull-request-available
>         Attachments: HIVE-22893.01.patch, HIVE-22893.02.patch, HIVE-22893.03.patch, HIVE-22893.04.patch,
HIVE-22893.05.patch, HIVE-22893.06.patch, HIVE-22893.07.patch, HIVE-22893.08.patch, HIVE-22893.09.patch,
HIVE-22893.10.patch, HIVE-22893.11.patch, HIVE-22893.12.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Right now if we have columnstat on a column ; we use that to estimate things about the
column; - however if an UDF is executed on a column ; the resulting column is treated as unknown
thing and defaults are assumed.
> An improvement could be to give wide estimation(s) in case of frequently used udf.
> For example; consider {{substr(c,1,1)}} ; no matter what the input; the output is at
most a 1 long string



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