korowa opened a new pull request, #2699:
URL: https://github.com/apache/arrow-datafusion/pull/2699
# Which issue does this PR close?
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Closes #2698.
# Rationale for this change
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Defined ordering of `SortMergeJoin` output may be helpful for query
planner/optimizer in general.
# What changes are included in this PR?
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Now there is `StreamedBatch.output_indices` -- single structure for storing
both streamed side indices with and without matches on buffered side, instead
of two separate places as before (`StreamedBatch.null_joined` and
`BufferedBatch.pair_joined`).
It allows to stage output indices in the order they appear as a result of
`join_partial` calls (which generally is an order of streamed/outer input),
and since `output_indices` now used for output batch creation, output batches
are also ordered.
# Are there any user-facing changes?
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No
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