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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-18359) Extend grouping set limits from int to long
Date Wed, 03 Jan 2018 10:03:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-18359?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Prasanth Jayachandran updated HIVE-18359:
-----------------------------------------
    Status: Patch Available  (was: Open)

> 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
>         Attachments: HIVE-18359.1.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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