tustvold opened a new pull request #1183:
URL: https://github.com/apache/arrow-rs/pull/1183
# Which issue does this PR close?
Relates to #1037 .
# Rationale for this change
When splitting a null bitmask off, the code added in #1054 would return the
entire bitmask that was read. This isn't a problem as `ArrayData` doesn't care
about trailing data in buffers, in fact it is critical for slices to work, but
it can be a tad surprising.
# What changes are included in this PR?
Modifies `DefinitionLevelBuffer::split_bitmask` to truncate the returned
`Bitmap` for the avoidance of confusion. Also uses a more efficient
`append_packed_range` to construct the remainder buffer.
# Are there any user-facing changes?
Adds a `BooleanBufferBuilder::resize` method
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