Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/15677
```Scala
val df2 = Seq((2.0f, 345)).toDF("a", "b")
checkAnswer(
df2.select(reverse($"a"), reverse($"b")),
Row("0.2", "543"))
```
The argument of `reverse` is not limited to `String`. Thus, `str - a string
expression.` is not right.
However, the complex type we should block. We also need to fix it in the
code.
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