Ye Zihao created IMPALA-12786:
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Summary: Optimize count(*) for JSON scans
Key: IMPALA-12786
URL: https://issues.apache.org/jira/browse/IMPALA-12786
Project: IMPALA
Issue Type: Sub-task
Components: be
Affects Versions: Impala 4.3.0
Reporter: Ye Zihao
Assignee: Ye Zihao
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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