Github user huaxingao commented on a diff in the pull request:
https://github.com/apache/spark/pull/20962#discussion_r178957855
--- Diff: python/pyspark/sql/column.py ---
@@ -454,6 +454,32 @@ def isin(self, *cols):
>>> df.select(df.name).orderBy(df.name.asc()).collect()
[Row(name=u'Alice'), Row(name=u'Tom')]
"""
+ _asc_nulls_first_doc = """
+ Returns a sort expression based on the ascending order of the given
column name and null values
+ return before non-null values
+
+ >>> from pyspark.sql import Row
--- End diff --
@HyukjinKwon Thank you very much for reviewing my changes! I verified the
doctest using
```
SPARK_TESTING=1 ./bin/pyspark pyspark.sql.column
```
It ran OK
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