[GitHub] chanansh commented on a change in pull request #23414: [Spark 26449][PYSPARK] add a transform method to the Dataframe class

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chanansh commented on a change in pull request #23414: [Spark 26449][PYSPARK] add a transform method to the Dataframe class
URL: https://github.com/apache/spark/pull/23414#discussion_r244580590
 
 

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 File path: python/pyspark/sql/dataframe.py
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 @@ -2045,7 +2045,46 @@ def toDF(self, *cols):
         """
         jdf = self._jdf.toDF(self._jseq(cols))
         return DataFrame(jdf, self.sql_ctx)
-
+    
+    @since(3.0)
+    def transform(self, func, *args, **kwargs):
+        """Returns a new class:`DataFrame` according to a user-defined custom transform method.
+        This allows chaining transformations rather than using nested or temporary variables.
+        
+        :param func: a user-defined custom transform function
+        :param *args: optional positional arguments to pass to `func`
+        :param **kwargs: optional keywarded arguments to pass to `func`
+        
+        A more concrete example::
 
 Review comment:
   can you please provide an example?

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