HyukjinKwon commented on a change in pull request #27406:
[SPARK-30681][PYSPARK][SQL] Add higher order functions API to PySpark
URL: https://github.com/apache/spark/pull/27406#discussion_r373292073
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File path: python/pyspark/sql/functions.py
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@@ -2840,6 +2840,360 @@ def from_csv(col, schema, options={}):
return Column(jc)
+def _invoke_higher_order_function(name):
+ """
+ Given name of the expression corresponding to a higher order SQL function,
+ return a function that takes
+
+ - a list of columns
+ - a list of tuples ((*Column) -> Column, Iterable[int])
+ where the second element represent allowed arities
+
+ invokes expression, and wraps result in a Column
+ (first Scala one, then Python).
+ """
+
+ def _(cols, funs):
Review comment:
@zero323, I know you were trying to logically separate the actual function
but how about we just avoid having a nested function here? I think it also
makes sense not to have the nested function here and I personally think it's a
bit confusing in particular to people not quite used to Python.
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