tustvold opened a new pull request, #3920:
URL: https://github.com/apache/arrow-rs/pull/3920
# Which issue does this PR close?
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Closes #3516
# Rationale for this change
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https://github.com/apache/arrow-rs/pull/3756 only added zero-copy conversion
between `Vec` and `Buffer` in order to keep the scope of the change down.
Unfortunately as discovered in #3917 this causes issues for the APIs that allow
converting an Array back into a builder, as the builders use MutableBuffer and
therefore are restricted by the alignment expectations of `MutableBuffer`.
# What changes are included in this PR?
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Adds zero-copy conversion to `MutableBuffer` by storing the `Layout` inline.
# Are there any user-facing changes?
This changes what can and can't be converted to a MutableBuffer, and removes
some low-level deprecated APIs. Downstream impact is likely to be extremely
marginal.
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