[MINOR]: Fix Optimize Projections Bug #8992
Merged
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Which issue does this PR close?
Closes #8978.
Rationale for this change
Aggregate requires at least one grouping or aggregate expression. In these cases, we do not optimize away all of the aggregate expressions, we keep one aggregate expression. However, because of the place of empty check, we didnot propagate its requirement below. This PR moves this check above so that its requirements can be propagated below.
What changes are included in this PR?
Are these changes tested?
Yes
Are there any user-facing changes?