Ben Kietzman created ARROW-11762:
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Summary: [C++][Dataset] Refactor Partitioning to explicitly treat
null and absent fields identically
Key: ARROW-11762
URL: https://issues.apache.org/jira/browse/ARROW-11762
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Affects Versions: 3.0.0
Reporter: Ben Kietzman
Fix For: 4.0.0
ARROW-10438 adds support for partition expressions with explicit absence of a
partition key by including an {{is_null(field_ref("absent key field name"))}}
in the conjunction. Whenever possible, this should be preferred to an
equivalent conjunction which simply omits an equality expression for the
missing field.
Additionally since an absent partition key and a null partition key is
semantically equivalent to a null valued partition key, we should ensure there
is no difference in behavior. Currently, {{equal(field_ref("a"), literal(0))}}
and {{and_(equal(field_ref("a"), literal(0)), is_null("b"))}} are formatted
differently
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