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Posted to issues@kudu.apache.org by "Andrew Wong (JIRA)" <ji...@apache.org> on 2019/06/13 18:41:01 UTC

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

Andrew Wong created KUDU-2852:
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             Summary: 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: Andrew Wong


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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