tustvold opened a new pull request #1219:
URL: https://github.com/apache/arrow-rs/pull/1219
# Which issue does this PR close?
Closes #504
# Rationale for this change
See ticket
# What changes are included in this PR?
Adds `ArrayData::ptr_eq` and then uses this to elide dictionary
concatenation in MutableArrayData
# Are there any user-facing changes?
This changes the behaviour of concat, to no longer concatenate the
dictionaries if they are the same. Not sure if this counts
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