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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