Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/9977#discussion_r45920666
--- Diff: python/pyspark/sql/functions.py ---
@@ -305,6 +297,10 @@ def input_file_name():
@since(1.6)
def isnan(col):
"""An expression that returns true iff the column is NaN.
+
+ >>> df = sqlContext.createDataFrame([(1.0, float('nan')),
(float('nan'), 2.0)], ("a", "b"))
+ >>> df.select(isnan("a").alias("r")).collect()
--- End diff --
can you test both string names and columns? e.g.
```python
df.select(isnan("a").alias("r1"), isnan(df.a).alias("r2")).collect()
```
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