Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20962#discussion_r179044620
--- Diff: python/pyspark/sql/functions.py ---
@@ -87,7 +87,15 @@ def _():
'col': 'Returns a :class:`Column` based on the given column name.',
'column': 'Returns a :class:`Column` based on the given column name.',
'asc': 'Returns a sort expression based on the ascending order of the
given column name.',
+ 'asc_nulls_first': 'Returns a sort expression based on the ascending
order of the given' +
+ ' column name, and null values return before
non-null values.',
+ 'asc_nulls_last': 'Returns a sort expression based on the ascending
order of the given' +
+ ' column name, and null values appear after non-null
values.',
'desc': 'Returns a sort expression based on the descending order of
the given column name.',
+ 'desc_nulls_first': 'Returns a sort expression based on the descending
order of the given' +
+ ' column name, and null values appear before
non-null values.',
+ 'desc_nulls_last': 'Returns a sort expression based on the descending
order of the given' +
+ ' column name, and null values appear after
non-null values',
--- End diff --
Just for sure, it's manually tested, right?
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