[maint-16.x] Cherry pick PRs related to windowed aggregations #4956
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…ateMode (apache#4878) * Fix column indices in EnforceDistribution optimizer in Partial AggregateMode Column expressions need to be updated to correspond with the partial aggregation schema rather than the input schema. * Simplify new_group_by calculation
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…ateMode (#4878)
Column expressions need to be updated to correspond with the partial aggregation schema rather than the input schema.
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