HyukjinKwon commented on a change in pull request #34240:
URL: https://github.com/apache/spark/pull/34240#discussion_r727654326
##########
File path: python/pyspark/sql/functions.py
##########
@@ -199,6 +199,78 @@ def min(col: "ColumnOrName") -> Column:
return _invoke_function_over_column("min", col)
+@since(3.3)
+def max_by(col: "ColumnOrName", ord: "ColumnOrName") -> Column:
+ """
+ Returns the value associated with the maximum value of ord.
+
+ .. versionadded:: 3.3.0
+
+ Parameters
+ ----------
+ col : :class:`~pyspark.sql.Column` or str
+ target column that the value will be returned
+ ord : :class:`~pyspark.sql.Column` or str
+ column to be maximized
+
+ Returns
+ -------
+ :class:`~pyspark.sql.Column`
+ value associated with the maximum value of ord.
+
+ Examples
+ --------
+ >>> df = spark.createDataFrame([
+ ... ("Java", 2012, 20000), ("dotNET", 2012, 5000),
+ ... ("dotNET", 2013, 48000), ("Java", 2013, 30000)],
+ ... schema=("course", "year", "earnings"))
+ >>> df.groupby("course").agg(max_by("year", "earnings")).show()
+ +------+----------------------+
+ |course|max_by(year, earnings)|
+ +------+----------------------+
+ | Java| 2013|
+ |dotNET| 2013|
+ +------+----------------------+
+ """
+ return _invoke_function("max_by", _to_java_column(col),
_to_java_column(ord))
+
+
+@since(3.3)
Review comment:
oops, actually doing this will break PySpark numpy doc formatting.
`@since` should be removed in all code bases in long term .. @yoda-mon mind
creating a small followup to remove both `since` here?
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