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Posted to dev@hive.apache.org by "Zoltan Haindrich (JIRA)" <ji...@apache.org> on 2017/11/20 08:05:00 UTC

[jira] [Created] (HIVE-18105) Aggregation of an empty set doesn't pass constants to the UDAF

Zoltan Haindrich created HIVE-18105:
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             Summary: Aggregation of an empty set doesn't pass constants to the UDAF
                 Key: HIVE-18105
                 URL: https://issues.apache.org/jira/browse/HIVE-18105
             Project: Hive
          Issue Type: Sub-task
            Reporter: Zoltan Haindrich


the groupbyoperator's logic for firstrow passes {{null}} for all parameters.
see here:
 {here|https://github.com/apache/hive/blob/39d46e8af5a3794f7395060b890f94ddc84516e7/ql/src/java/org/apache/hadoop/hive/ql/exec/GroupByOperator.java#L1116}

this could obstruct {{compute_stats}} operations because it has a constant argument.



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