c21 opened a new pull request #34826:
URL: https://github.com/apache/spark/pull/34826
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### What changes were proposed in this pull request?
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We can support `SortAggregateExec` code-gen without grouping keys. When
there's no grouping key, sort aggregate should share same execution logic with
hash aggregate.
At a high level, this PR does
* `spark.sql.codegen.aggregate.sortAggregate.enabled`: a new config
(user-facing) is introduced to allow users to disable sort aggregate in case
anything going wrong, and it's enabled by default.
* `spark.sql.aggregate.forceApplySortAggregate`: an internal config
(non-user-facing) is introduced to allow developers test sort aggregate, to
improve unit test coverage of it. We already had a similar config for shuffled
hash join.
* `AggregateCodegenSupport.scala`: The base class to have implementation of
code-gen without grouping keys and other code-gen related boilerplate code. The
subclass is required to implement `doProduceWithKeys()` and
`doConsumeWithKeys()` to handle aggregate with grouping keys. The
implementation in this class is copied literarily from `HashAggregateExec`.
* `HashAggregateExec.scala`: only keeps its original `doProduceWithKeys()`
and `doConsumeWithKeys()`.
* `SortAggregateExec.scala`: extends `AggregateCodegenSupport.scala` to
support code-gen without grouping keys.
The implementation of `SortAggregateExec` code-gen with grouping keys will
be added in follow-up PR.
### Why are the changes needed?
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To enable code-gen for sort aggregate, so we can have better query
performance when sort aggregate is used.
### Does this PR introduce _any_ user-facing change?
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The config of `spark.sql.codegen.aggregate.sortAggregate.enabled` to
enable/disable sort aggregate code-gen.
### How was this patch tested?
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Added unit test in `WholeStageCodegenSuite.scala`.
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