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https://issues.apache.org/jira/browse/IMPALA-12786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Smith resolved IMPALA-12786.
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Fix Version/s: Impala 4.5.0
Resolution: Fixed
> Optimize count(*) for JSON scans
> --------------------------------
>
> Key: IMPALA-12786
> URL: https://issues.apache.org/jira/browse/IMPALA-12786
> Project: IMPALA
> Issue Type: Sub-task
> Components: Backend
> Affects Versions: Impala 4.3.0
> Reporter: Zihao Ye
> Assignee: Zihao Ye
> Priority: Major
> Fix For: Impala 4.5.0
>
>
> The current JSON scanner does not optimize the scanning of count(*) (zero
> slots). Even if we do not need the actual data of any fields, the JSON parser
> will still parse and copy strings during the scanning process. Skipping these
> parsing and copying operations during the scanning of zero slots can
> significantly improve performance.
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