Chenxi Li created ARROW-15441:
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Summary: [C++][Compute] hash_count aggregation of a null type
column is incorrect
Key: ARROW-15441
URL: https://issues.apache.org/jira/browse/ARROW-15441
Project: Apache Arrow
Issue Type: Bug
Components: C++
Reporter: Chenxi Li
Assignee: Chenxi Li
The result of hash_count such array is incorrect.
||argument||key||
|NULL|1|
|NULL|1|
||CountOptions||Expected||Actual||
|ALL|2|2|
|ONLY_VALID|{color:#FF0000}0{color}|{color:#FF0000}2{color}|
|ONLY_NULL|{color:#FF0000}2{color}|{color:#FF0000}0{color}|
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