refactor(hash-aggr): Migrate single mode hash aggregation#23408
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2010YOUY01 wants to merge 2 commits into
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refactor(hash-aggr): Migrate single mode hash aggregation#234082010YOUY01 wants to merge 2 commits into
2010YOUY01 wants to merge 2 commits into
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alamb
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Jul 9, 2026
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I hope to review this tomorrow
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Which issue does this PR close?
Part of #22710
Rationale for this change
This PRs implements the single aggregation (fused partial and final aggregation into a single physical plan operator). This mode can be planed if input is already hash/range partitioned.
See comments at datafusion/physical-plan/src/aggregates/single_stream.rs for details.
What changes are included in this PR?
AggregateHashTable<SingleMarker>variant to handle single aggregation.SingleHashAggregateStreamthat usesAggregateHashTable<SingleMarker>to implement the single aggregation state machine.Are these changes tested?
Existing tests for functionalities + UT for planning
Are there any user-facing changes?
No