yongster opened a new pull request, #10991:
URL: https://github.com/apache/arrow-rs/pull/10991
`nullif` creates nulls by adding a top-level validity bitmap. This works for
most arrays, but RunEndEncoded and Union arrays derive logical nullability
from
their child arrays instead.
As a result, `nullif` previously returned non-null values at positions where
the condition was true for these array types.
Closes #10990
- Delegate `nullif` for RunEndEncoded and Union arrays to `take`, using null
indices for the positions selected by the condition.
- Return an error when a RunEndEncoded values field is non-nullable and
cannot
represent the requested nulls.
- Return an error when a Union has no nullable child that can represent null
indices.
- Prefer a nullable Union child when `take` needs to represent a null index.
- Add coverage for nullable and non-nullable REE, plus dense and sparse Union
cases.
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