David Li created ARROW-13574:
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Summary: [C++] Implement "count(*)" hash aggregate kernel
Key: ARROW-13574
URL: https://issues.apache.org/jira/browse/ARROW-13574
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: David Li
The current "count" hash aggregate kernel counts either all non-null or all
null values, but doesn't count all values regardless of nullity (i.e. SQL
"count(*)" or Pandas size()).
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