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Posted to issues@beam.apache.org by "Brian Hulette (Jira)" <ji...@apache.org> on 2020/11/18 21:10:00 UTC

[jira] [Updated] (BEAM-11303) DataFrame GroupBy().size() aggregation produces incorrect results

     [ https://issues.apache.org/jira/browse/BEAM-11303?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Brian Hulette updated BEAM-11303:
---------------------------------
    Status: Open  (was: Triage Needed)

> DataFrame GroupBy().size() aggregation produces incorrect results
> -----------------------------------------------------------------
>
>                 Key: BEAM-11303
>                 URL: https://issues.apache.org/jira/browse/BEAM-11303
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>    Affects Versions: 2.25.0
>            Reporter: Brian Hulette
>            Assignee: Brian Hulette
>            Priority: P2
>
> size is treated as a liftable aggregation which assumes it is commutative and associative, but it's not actually commutative. It can be lifted, but the post agg step needs to be a sum.
> This means the size aggregation will produce incorrect results.



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