Chenxi Li created ARROW-12942:
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Summary: [C++] 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
Affects Versions: 4.0.1, 4.0.0
Reporter: Chenxi Li
Assignee: Chenxi Li
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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