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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2023/06/12 16:04:00 UTC

[jira] [Created] (IMPALA-12206) Improve metrics for late materialization

Csaba Ringhofer created IMPALA-12206:
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             Summary: Improve metrics for late materialization
                 Key: IMPALA-12206
                 URL: https://issues.apache.org/jira/browse/IMPALA-12206
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
            Reporter: Csaba Ringhofer


Based on the profile it can be hard to tell whether late materialization was useful. For example in "SELECT * FROM functional_parquet.alltypesagg WHERE bigint_col = 1000 AND int_col = 50;"  all rows are skipped based on only 2 columns, but in the profile NumPagesSkippedByLateMaterialization is 0, while practically a lot pages were skipped for the rest of the columns.



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