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Posted to issues@arrow.apache.org by "Ben Kietzman (Jira)" <ji...@apache.org> on 2021/02/24 15:30:00 UTC
[jira] [Created] (ARROW-11762) [C++][Dataset] Refactor Partitioning
to explicitly treat null and absent fields identically
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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