korowa opened a new pull request, #10591:
URL: https://github.com/apache/datafusion/pull/10591
## Which issue does this PR close?
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Closes #.
## Rationale for this change
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the issue then this section is not needed.
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Initial intention was to improve clickbench q34 -- it contains aggregation
by constant and URL which makes aggregation switch to row-based mode which is
slower that single field group by.
In general, elimination of constants from `GROUP BY` seems to be reasonable
optimization.
## 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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New logical optimizer rule which removes constant or originated from
constant expressions from `Aggregate::group_expr`, and places additional
projection on top of aggregation, to satisfy original schema for downstream
operators.
Optimizer rule is placed between last `SimplifyExpressions` and
`OptimizeProjections`, since it requires constant evaluation, and projections,
produced by this rule, may be merged.
## Are these changes tested?
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New unit tests and sqllogictests
## Are there any user-facing changes?
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No
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