Fix "Projection references non-aggregate values" by updating rebase_expr
to use transform_down
#8890
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Which issue does this PR close?
Closes #8280
Closes #8898
Rationale for this change
rebase_expr should strive to re-base on the outermost available base expression in order to minimize (however negligible) the computation that needs to be done on top of it.
What changes are included in this PR?
rebase_expr()
Are these changes tested?
Yes
Are there any user-facing changes?
No