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Posted to issues@impala.apache.org by "Peter Ebert (JIRA)" <ji...@apache.org> on 2018/01/17 20:35:00 UTC

[jira] [Created] (IMPALA-6411) Compute stats for a subset of columns

Peter Ebert created IMPALA-6411:
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             Summary: Compute stats for a subset of columns
                 Key: IMPALA-6411
                 URL: https://issues.apache.org/jira/browse/IMPALA-6411
             Project: IMPALA
          Issue Type: Improvement
    Affects Versions: Impala 2.11.0
            Reporter: Peter Ebert


For tables with a large # of columns (>400), the metadata and processing time for computing stats on all columns becomes prohibitively expensive.  It would increase performance and reduce catalog memory to be able to run stats only on a subset of columns that are frequently accessed.



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