Github user HyukjinKwon commented on a diff in the pull request:
    --- Diff: python/pyspark/sql/ ---
    @@ -1446,7 +1457,7 @@ def all_of_(xs):
             if isinstance(to_replace, (float, int, long, basestring)):
                 to_replace = [to_replace]
    -        if isinstance(value, (float, int, long, basestring)):
    +        if isinstance(value, (float, int, long, basestring)) or value is 
    --- End diff --
    This looks causing the warning always:
    >>> df = sc.parallelize([("Alice", 1, 3.0)]).toDF()
    >>> df.replace({"Alice": "Bob"}).show()
    .../spark/python/pyspark/sql/ UserWarning: to_replace is 
a dict and value is not None. value will be ignored.
      warnings.warn("to_replace is a dict and value is not None. value will be 
    Could we put this line into 1468L (under `else`)? 

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