tustvold opened a new pull request, #2999:
URL: https://github.com/apache/arrow-rs/pull/2999
# Which issue does this PR close?
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Part of #2108
# Rationale for this change
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In order to eventually support skipping repetition levels, there needs to be
a mechanism for reading ahead when decoding level information, as you don't
know ahead of time how many levels correspond to a given row.
This PR adds such a buffer, and hooks it up for when decoding definition
levels. Here it just acts as a performance optimization to avoid decoding
values one at a time, but it will be vital to support skipping repetition
levels.
# What changes are included in this PR?
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# Are there any user-facing changes?
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