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https://issues.apache.org/jira/browse/IMPALA-11228?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Quanlong Huang updated IMPALA-11228:
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Epic Link: IMPALA-9040
> Enable count(*) optimization for full acid table.
> --------------------------------------------------
>
> Key: IMPALA-11228
> URL: https://issues.apache.org/jira/browse/IMPALA-11228
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Riza Suminto
> Priority: Major
>
> [IMPALA-11123|http://issues.apache.org/jira/browse/IMPALA-11123] implement
> count(*) optimization for ORC file format.
> However, it is still disabled for full ACID table.
> If we can figure out in the planing time that all files to be scanned are
> already compacted, we should be OK to enable count(*) optimization. See
> comments of ReadsFileMetadataOnly() and RequireRowValidation() for more
> details:
> https://github.com/apache/impala/blob/f932d78/be/src/exec/hdfs-scan-node-base.h#L579-L603
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