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Posted to issues@kudu.apache.org by "Todd Lipcon (Jira)" <ji...@apache.org> on 2019/12/20 22:14:00 UTC

[jira] [Created] (KUDU-3032) key columns unnecessarily selected when predicate is converted to range

Todd Lipcon created KUDU-3032:
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             Summary: key columns unnecessarily selected when predicate is converted to range
                 Key: KUDU-3032
                 URL: https://issues.apache.org/jira/browse/KUDU-3032
             Project: Kudu
          Issue Type: Bug
          Components: perf
    Affects Versions: 1.11.1
            Reporter: Todd Lipcon


When a predicate applies to leading primary key columns, the tablet service optimizes it into a range scan and removes those predicates from the ScanSpec. However, the current behavior (seemingly going back to when this was implemented) does not actually prevent those key columns from being read from disk. This has a negative performance impact, particularly when the keys are large or inefficient to decompress.



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