HyukjinKwon commented on code in PR #37575:
URL: https://github.com/apache/spark/pull/37575#discussion_r950057627
##########
python/pyspark/sql/functions.py:
##########
@@ -307,34 +485,120 @@ def min_by(col: "ColumnOrName", ord: "ColumnOrName") ->
Column:
return _invoke_function_over_columns("min_by", col, ord)
-@since(1.3)
def count(col: "ColumnOrName") -> Column:
"""
Aggregate function: returns the number of items in a group.
+
+ .. versionadded:: 1.3.0
+
+ Parameters
+ ----------
+ col : :class:`~pyspark.sql.Column` or str
+ target column to compute on.
+
+ Returns
+ -------
+ :class:`~pyspark.sql.Column`
+ column for compuated results.
+
+ Examples
+ --------
+ Count by all columns (start), and by a column that does not count ``None``.
+
+ >>> df = spark.createDataFrame([(None,), ("a",), ("b",), ("c",)],
schema=["alphabets"])
+ >>> df.select(count(expr("*")), count(df.alphabets)).show()
+ +--------+----------------+
+ |count(1)|count(alphabets)|
+ +--------+----------------+
+ | 4| 3|
+ +--------+----------------+
"""
return _invoke_function_over_columns("count", col)
-@since(1.3)
def sum(col: "ColumnOrName") -> Column:
"""
Aggregate function: returns the sum of all values in the expression.
+
+ .. versionadded:: 1.3.0
+
+ Parameters
+ ----------
+ col : :class:`~pyspark.sql.Column` or str
+ target column to compute on.
+
+ Returns
+ -------
+ :class:`~pyspark.sql.Column`
+ the column for compuated results.
+
+ Examples
+ --------
+ >>> df = spark.range(10)
+ >>> df.select(sum(df["id"])).show()
+ +-------+
+ |sum(id)|
+ +-------+
+ | 45|
+ +-------+
"""
return _invoke_function_over_columns("sum", col)
-@since(1.3)
def avg(col: "ColumnOrName") -> Column:
"""
Aggregate function: returns the average of the values in a group.
+
+ .. versionadded:: 1.3.0
+
+ Parameters
+ ----------
+ col : :class:`~pyspark.sql.Column` or str
+ target column to compute on.
+
+ Returns
+ -------
+ :class:`~pyspark.sql.Column`
+ the column for compuated results.
+
+ Examples
+ --------
+ >>> df = spark.range(10)
+ >>> df.select(avg(col("id"))).show()
+ +-------+
+ |avg(id)|
+ +-------+
+ | 4.5|
+ +-------+
"""
return _invoke_function_over_columns("avg", col)
-@since(1.3)
def mean(col: "ColumnOrName") -> Column:
"""
Aggregate function: returns the average of the values in a group.
+
+ .. versionadded:: 1.3.0
Review Comment:
Thanks @Yikun. Some more followsup are coming. I will point this out.
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