Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17469#discussion_r109309888
--- Diff: python/pyspark/sql/column.py ---
@@ -303,8 +333,25 @@ def isin(self, *cols):
desc = _unary_op("desc", "Returns a sort expression based on the"
" descending order of the given column name.")
- isNull = _unary_op("isNull", "True if the current expression is null.")
- isNotNull = _unary_op("isNotNull", "True if the current expression is
not null.")
+ _isNull_doc = ''' True if the current expression is null. Often
combined with
+ :func:`DataFrame.filter` to select rows with null
values.
+
+ >>> df2.collect()
+ [Row(name=u'Tom', height=80), Row(name=u'Alice',
height=None)]
+ >>> df2.filter( df2.height.isNull ).collect()
+ [Row(name=u'Alice', height=None)]
+ '''
+ _isNotNull_doc = ''' True if the current expression is null. Often
combined with
--- End diff --
BTW, just a question. Do we need the leading space here in the
documentation? I think we should remove if it is unnecessary.
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