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Posted to issues@hive.apache.org by "Ankit Singhal (JIRA)" <ji...@apache.org> on 2018/04/02 12:24:00 UTC

[jira] [Commented] (HIVE-18872) Projection is not pushed properly when query involves multiple tables

    [ https://issues.apache.org/jira/browse/HIVE-18872?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16422195#comment-16422195 ] 

Ankit Singhal commented on HIVE-18872:
--------------------------------------

bq. Could you please add description and repro/testcase for this issue?
I updated the description with the details. The bug affects the push down of projections during getSplit() path. Let me know if there is already a test case touches this flow, I can try to reproduce the same with it.



> Projection is not pushed properly when query involves multiple tables
> ---------------------------------------------------------------------
>
>                 Key: HIVE-18872
>                 URL: https://issues.apache.org/jira/browse/HIVE-18872
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Ankit Singhal
>            Assignee: Ankit Singhal
>            Priority: Major
>             Fix For: 3.0.0
>
>         Attachments: HIVE-18872.patch
>
>
> Projections are not pushed down properly during getSplit() when the query involves multiple tables although they are getting properly pushed during getRecordReader when the task is working on the split. Due to this , storage handler relying on projections for building query while generating input splits are not working.



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