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Posted to issues@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2018/02/07 11:14:00 UTC

[jira] [Commented] (HIVE-18359) Extend grouping set limits from int to long

    [ https://issues.apache.org/jira/browse/HIVE-18359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16355323#comment-16355323 ] 

Prasanth Jayachandran commented on HIVE-18359:
----------------------------------------------

rebased patch

> Extend grouping set limits from int to long
> -------------------------------------------
>
>                 Key: HIVE-18359
>                 URL: https://issues.apache.org/jira/browse/HIVE-18359
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Prasanth Jayachandran
>            Assignee: Prasanth Jayachandran
>            Priority: Major
>         Attachments: HIVE-18359.1.patch, HIVE-18359.2.patch, HIVE-18359.3.patch, HIVE-18359.4.patch, HIVE-18359.5.patch, HIVE-18359.6.patch, HIVE-18359.7.patch, HIVE-18359.8.patch
>
>
> Grouping sets is broken for >32 columns because of usage of Int for bitmap (also GROUPING__ID virtual column). This assumption breaks grouping sets/rollups/cube when number of participating aggregation columns is >32. The easier fix would be extend it to Long for now. The correct fix would be to use BitSets everywhere but that would require GROUPING__ID column type to binary which will make predicates on GROUPING__ID difficult to deal with. 



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