Nikhil Sheoran created SPARK-46640:
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Summary: RemoveRedundantAliases does not account for references in
SubqueryExpression when removing aliases
Key: SPARK-46640
URL: https://issues.apache.org/jira/browse/SPARK-46640
Project: Spark
Issue Type: Bug
Components: Optimizer
Affects Versions: 4.0.0
Reporter: Nikhil Sheoran
Fix For: 4.0.0
`RemoveRedundantAliases{{{}`{}}} does not take into account the outer
attributes of a `SubqueryExpression` aliases, potentially removing them if it
thinks they are redundant.
This can cause scenarios where a subquery expression has conditions like `a#x =
a#x` i.e. both the attribute names and the expression ID(s) are the same. This
can then lead to conflicting expression ID(s) error.
In `RemoveRedundantAliases`, we have an excluded AttributeSet argument denoting
the references for which we should not remove aliases. For a query with a
subquery expression, adding the references of this subquery in the excluded set
prevents such rewrite from happening.
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