Github user wajda commented on the issue:
https://github.com/apache/spark/pull/21155
Regarding ```step, stop, step``` vs. ```arg1, arg2, arg3```, ```left,
middle, right``` and so on. Originally I used those to avoid hiding variables
from the outer scope, but after the final refactoring it doesn't seem to be an
issue anymore. I'll rename those, but I would keep ones as is for the ```def
eval(input1: Any, input2: Any, input3: Any)``` method implementations. The
reason is to distinguish the argument of type Any from their cast references as
below:
```
override def eval(input1: Any, input2: Any, input3: Any): Array[T] = {
val start = input1.asInstanceOf[T]
val stop = input2.asInstanceOf[T]
val step = input3.asInstanceOf[T]
```
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