Github user HyukjinKwon commented on a diff in the pull request:

    https://github.com/apache/spark/pull/17192#discussion_r105605336
  
    --- Diff: python/pyspark/sql/functions.py ---
    @@ -1802,10 +1802,10 @@ def from_json(col, schema, options={}):
     @since(2.1)
     def to_json(col, options={}):
         """
    -    Converts a column containing a [[StructType]] into a JSON string. 
Throws an exception,
    -    in the case of an unsupported type.
    +    Converts a column containing a [[StructType]] or [[ArrayType]] into a 
JSON string.
    +    Throws an exception, in the case of an unsupported type.
    --- End diff --
    
    If you don't strongly feel about this, let me leave as is (and sweep it in 
another PR). In most cases, I believe users will use directly with `select`.


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