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https://issues.apache.org/jira/browse/ARROW-12942?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ben Kietzman updated ARROW-12942:
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Fix Version/s: 5.0.0
> [C++][Compute] The result of Arrow compute hash_min_max is incorrect if there
> are new groups in the subsequent chunks
> ---------------------------------------------------------------------------------------------------------------------
>
> Key: ARROW-12942
> URL: https://issues.apache.org/jira/browse/ARROW-12942
> Project: Apache Arrow
> Issue Type: Bug
> Components: C++
> Affects Versions: 4.0.0, 4.0.1
> Reporter: Chenxi Li
> Assignee: Chenxi Li
> Priority: Major
> Labels: pull-request-available
> Fix For: 5.0.0
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> If there are new groups in the subsequent chunks of a chunked array, the
> result of Arrow compute hash_min_max is incorrect.
> For example, a table with two chunks, the second chunk has a new group key
> {code:java}
> First chunk: {"argument": 1, "key": 0},
> Second chunk: {"argument": 0, "key": 1}
> {code}
> the result of hash_min_max by "key" with such data is
> {code:java}
> [{"min": null, "max": null}, 0],
> [{"min": 0, "max": 0}, 1]
> {code}
> But it should be
> {code:java}
> [{"min": 1, "max": 1}, 0],
> [{"min": 0, "max": 0}, 1]
> {code}
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