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Posted to dev@hive.apache.org by "Prasanth Jayachandran (JIRA)" <ji...@apache.org> on 2018/01/02 23:22:00 UTC

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

Prasanth Jayachandran created HIVE-18359:
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             Summary: 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


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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