Allow aggregation without projection in Unparser
#13326
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Unparser
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Which issue does this PR close?
Closes #12773
Rationale for this change
When parsing a query into a logical plan, aggregation precedes projection. But optimiser can eliminate projection, leaving aggregation as a top node. This is not expected by
select_to_sql_recursivelybecause it always handles projection and aggregation together.What changes are included in this PR?
Added a separate branch if aggregation is the top node.
Are these changes tested?
Yes, added a new test
Are there any user-facing changes?
No