HyukjinKwon commented on code in PR #50867:
URL: https://github.com/apache/spark/pull/50867#discussion_r2125397373


##########
sql/core/src/main/scala/org/apache/spark/sql/execution/python/ExtractPythonUDFs.scala:
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@@ -169,24 +169,64 @@ object ExtractPythonUDFs extends Rule[LogicalPlan] with 
Logging {
     e.exists(PythonUDF.isScalarPythonUDF)
   }
 
+  /**
+   * Return true if we should extract the current expression, including all of 
its current
+   * children (including UDF expression, and all others), to a logical node.
+   * The children of the expression can be udf expressions, this would be 
`chaining`.

Review Comment:
   `chaining` Let's don't mix the wording with `fusing`.



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