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Posted to issues@impala.apache.org by "YifanZhang (Jira)" <ji...@apache.org> on 2024/02/08 15:36:00 UTC

[jira] [Resolved] (IMPALA-12631) Improve count star performance for parquet scans

     [ https://issues.apache.org/jira/browse/IMPALA-12631?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

YifanZhang resolved IMPALA-12631.
---------------------------------
    Fix Version/s: Impala 4.4.0
       Resolution: Fixed

> Improve count star performance for parquet scans
> ------------------------------------------------
>
>                 Key: IMPALA-12631
>                 URL: https://issues.apache.org/jira/browse/IMPALA-12631
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: YifanZhang
>            Assignee: YifanZhang
>            Priority: Major
>             Fix For: Impala 4.4.0
>
>
> The code in the backend function HdfsParquetScanner::GetNextInternal() is not efficient now. We use row group statistics instead of file meta statistics, which leads to unnecessary materialization overhead.



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