peter-toth commented on PR #55885:
URL: https://github.com/apache/spark/pull/55885#issuecomment-5451840027

   @metanil this has gone a month without a rebase, and something landed in the 
meantime that bears directly on it.
   
   **SPARK-58769** (#58002, merged to master and branch-4.x) dropped the 
name-based transform comparison, so `TransformExpression` now compares its 
bound functions with `equals`, and it documents that contract on 
`BoundFunction`. A connector whose `bind` returns instances that do not compare 
equal no longer gets a match by function name. That matters here, because the 
truncate reducers are looked up per side and compared. There is also an open 
follow-up, #58363, clarifying the same contract.
   
   Could you rebase on master and adjust for it? I will take another pass once 
it is green.
   


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