tustvold opened a new pull request, #1842:
URL: https://github.com/apache/arrow-rs/pull/1842
# Which issue does this PR close?
Follow on from #1591
# Rationale for this change
`mutable_buffer_to_builder` created an untyped back-door to creating a
`BufferBuilder<T>` with arbitrary `MutableArray`. This makes it hard to reason
about the invariants of the `MutableArray` belonging to a `BufferBuilder`.
# What changes are included in this PR?
This instead implements UnionArray using type-erasure, which is safer and
less code.
# Are there any user-facing changes?
No
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