mattcuento opened a new pull request, #1451:
URL: https://github.com/apache/datafusion-ballista/pull/1451
…
# Which issue does this PR close?
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Closes #1432 .
# Rationale for this change
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Why are you proposing this change? If this is already explained clearly in
the issue then this section is not needed.
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The default `BatchPartitioner` used in sort-based shuffle creates separate
`RecordBatch` instances for each output partition. In situations where the
number of output partitions is high, there's a lot of overhead in the metadata
with each `RecordBatch`.
This PR aims to defer materializing the shuffled output batches until
spilling/writing results. In the interim, the same input batches are stored,
and rows for each partition are tracked via a separate index data structure.
# What changes are included in this PR?
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sometimes worth providing a summary of the individual changes in this PR.
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- Remove the `PartitionBuffer` struct
- Introduce `InputBatchStore` and `ScratchSpace` for storing input batches
and tracking output partition ownership
- Integrate the above structs to defer materialization until spilling or
finalizing results
# Are there any user-facing changes?
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updated before approving the PR.
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No
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