beliefer opened a new pull request, #38461:
URL: https://github.com/apache/spark/pull/38461

   ### What changes were proposed in this pull request?
   Recently, I read the `MergeScalarSubqueries` because it is a feature used 
for improve performance.
   I fount the parameters of ScalarSubqueryReference is hard to understand, so 
I want add some comments on it.
   
   Additionally, the private method `supportedAggregateMerge` of 
`MergeScalarSubqueries` looks redundant, this PR wants simplify the code.
   
   
   ### Why are the changes needed?
   Improve the readability and simplify the code for `MergeScalarSubqueries`.
   
   
   ### Does this PR introduce _any_ user-facing change?
   'No'.
   Just improve the readability and simplify the code for 
`MergeScalarSubqueries`.
   
   
   ### How was this patch tested?
   Exists tests.
   


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