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add EliminateSubqueryAliases
Which issue does this PR close?
Closes #5407.
Rationale for this change
What changes are included in this PR?
Are these changes tested?
Are there any user-facing changes?
This PR is blocked by alias schema.
Due to we hope to keep same name, we will add some alias like col1 as t1.a, but its field is t1.a, original field is t1.a.
I'm resolving this problem.
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