Github user BryanCutler commented on the issue:

    https://github.com/apache/spark/pull/21650
  
    Would you mind changing cast (1) in your description?  It threw me off a 
little as they looked independent at first glance.  Maybe something like:
    ```
    df = spark.range(0, 1).toDF('v') \
        .withColumn('foo', f1(df['v'])) \
        .withColumn('bar', f2(df['v']))
    ```


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