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Posted to issues@kudu.apache.org by "Bankim Bhavsar (Jira)" <ji...@apache.org> on 2019/10/14 17:47:00 UTC

[jira] [Assigned] (KUDU-2852) Push predicate evaluation into more CFile decoders

     [ https://issues.apache.org/jira/browse/KUDU-2852?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Bankim Bhavsar reassigned KUDU-2852:
------------------------------------

    Assignee: Bankim Bhavsar  (was: Attila Bukor)

> Push predicate evaluation into more CFile decoders
> --------------------------------------------------
>
>                 Key: KUDU-2852
>                 URL: https://issues.apache.org/jira/browse/KUDU-2852
>             Project: Kudu
>          Issue Type: Improvement
>          Components: cfile, perf
>            Reporter: Andrew Wong
>            Assignee: Bankim Bhavsar
>            Priority: Major
>              Labels: newbie
>
> Commit c0f3727 added an optimization to push predicate evaluation into the CFile decoders without fully materializing the contents of each cblock. It did this with dictionary-encoded blocks, but the optimization can be applied to any other encoding types too.
> A low hanging fruit is RLE decoders, which should be able to evaluate the predicate for each run instead of materializing each cell and then applying the predicate.
> KUDU-736 also notes that we may be able to apply some predicates on bitshuffled data.
>  



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