Add comments to physical optimizer tests #14075
Merged
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Which issue does this PR close?
Rationale for this change
I tried to move some of these tests to be with the code they are testing, but found out the reason is the dependency on ParquetExec
What changes are included in this PR?
Add comments explaining this rationale so it is clearer to the next reader
Are these changes tested?
Are there any user-facing changes?
No