jonmmease opened a new pull request, #4846:
URL: https://github.com/apache/arrow-datafusion/pull/4846
# Which issue does this PR close?
Closes #4845.
# What changes are included in this PR?
Adds an implementation of `retract_batch` to `AvgAccumulator` that is
identical to the implementation for `SumAccumulator`.
# Are these changes tested?
I added `AVG` to a couple of existing tests that previously failed with
`"Retractable Accumulator hasn't been implemented..."` error.
# Are there any user-facing changes?
`AVG` can now be used in window expressions with custom frames.
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