Simplify spilling merge logic in GroupedHashAggregate #12517
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Instead have extra branches and logic for spill merging we instead just create a new GroupedHashAggregate stream for doing the merge.
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Instead have extra branches and logic for spill merging we instead just
create a new GroupedHashAggregate stream for doing the merge.
Which issue does this PR close?
Related to #12335.
Rationale for this change
What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?