[jira] [Created] (ARROW-11762) [C++][Dataset] Refactor Partitioning to explicitly treat null and absent fields identically

["Ben Kietzman (Jira)" <ji...@apache.org>]

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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