[jira] [Created] (PIG-3649) POPartialAgg incorrectly calculates size reduction when multiple values aggregated

["Travis Woodruff (JIRA)" <ji...@apache.org>]

Travis Woodruff created PIG-3649:
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             Summary: POPartialAgg incorrectly calculates size reduction when multiple values aggregated
                 Key: PIG-3649
                 URL: https://issues.apache.org/jira/browse/PIG-3649
             Project: Pig
          Issue Type: Bug
    Affects Versions: 0.11.1, 0.12.0, 0.11
            Reporter: Travis Woodruff


{{POPartialAgg.aggregate()}} counts the number of output columns ({{valueTuple.size() - 1}}), but {{checkSizeReduction()}} compares this to the number of input tuples. 

When multiple columns are aggregated, this causes the reduction factor to be calculated as too high by a factor of the number of columns being aggregated, which causes in-memory aggregation to be disabled when it should not be, adversely affecting performance,



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