Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/17469#discussion_r109309540 --- 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 --- End diff -- It seems the key is consistency in this case. We could use `"""` here if there is no specific other reasons.
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