Github user MasterDDT commented on the issue:
https://github.com/apache/spark/pull/17400
Just curious, how come the fix is not in this code?
https://github.com/maropu/spark/blob/b5d1038edffff5d65a6ddec20ea6eef186d25fc3/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Canonicalize.scala#L41
So anywhere we compare expressions for semantic equality, we can say `a#1`
is the same as `a#1 as b#2`?
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