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Posted to issues-all@impala.apache.org by "Riza Suminto (Jira)" <ji...@apache.org> on 2023/05/05 16:07:00 UTC

[jira] [Reopened] (IMPALA-11123) Optimize count(*) for ORC scans

     [ https://issues.apache.org/jira/browse/IMPALA-11123?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Riza Suminto reopened IMPALA-11123:
-----------------------------------

We found out that the commit for IMPALA-11123 can cause significant regression for non-optimized counts star query in parquet format.

I'm reopening this Jira and prepare a revert patch here:
https://gerrit.cloudera.org/c/19843/

> Optimize count(*) for ORC scans
> -------------------------------
>
>                 Key: IMPALA-11123
>                 URL: https://issues.apache.org/jira/browse/IMPALA-11123
>             Project: IMPALA
>          Issue Type: Improvement
>            Reporter: Quanlong Huang
>            Assignee: Riza Suminto
>            Priority: Critical
>              Labels: ramp-up
>             Fix For: Impala 4.1.0
>
>
> IMPALA-5036 and IMPALA-6501 added an optimisation for count\(*\) in Parquet and Kudu scans that avoids materialising dummy rows. We should do something similar for ORC.
> Refer IMPALA-5036 for more details.



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