prakharjain09 opened a new pull request #30300:
URL: https://github.com/apache/spark/pull/30300
### What changes were proposed in this pull request?
This pull request tries to remove unneeded exchanges in cases when we have
an INNER join followed by a Project with alias.
Ex - SortMergeJoin (SMJ2)
|
Project
|
SortMergeJoin (SMJ1)
In such cases, The projects output partitioning is same as SMJ1's
partitioning but if there are aliases in Project, we need to normalize the
attributes.
### Why are the changes needed?
To remove unneeded exchanges.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
New UT added.
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