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https://issues.apache.org/jira/browse/IMPALA-11123?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17721620#comment-17721620
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ASF subversion and git services commented on IMPALA-11123:
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Commit bd4a817893d261d756144363d246b5ebeeb40639 in impala's branch
refs/heads/master from Riza Suminto
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=bd4a81789 ]
IMPALA-11123: Restore NumFileMetadataRead counter
NumFileMetadataRead counter was lost with the revert of commit
f932d78ad0a30e322d59fc39072f710f889d2135. This patch restore
NumFileMetadataRead counter and also assertions in impacted iceberg test
files. Other impacted test files will be gradually restored with
reimplementation of optimized count star for ORC.
Testing:
- Pass core tests.
Change-Id: Ib14576245d978a127f688e265cab2f4ff519600c
Reviewed-on: http://gerrit.cloudera.org:8080/19854
Reviewed-by: Impala Public Jenkins <[email protected]>
Tested-by: Impala Public Jenkins <[email protected]>
> 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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