Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/5154#issuecomment-85829370
@zzcclp
children:Seq[Expression] essentially can be either `List[Expression]` or
`ArraySeq[Expression]`, the later doesn't support the pattern matching.
Probably you have to use the code like:
```scala
val f = children.size match {
case 1 =>
val func = function.asInstanceOf[(Any) => Any]
val child0 = children(0)
(input: Row) => {
func(ScalaReflection.convertToScala(child0.eval(input),
child0.dataType)))
}
case 2 =>
val func = function.asInstanceOf[(Any) => Any]
val child0 = children(0)
val child1 = children(1)
(input: Row) => {
func(ScalaReflection.convertToScala(child0.eval(input),
child0.dataType))
ScalaReflection.convertToScala(child1.eval(input), child1.dataType)))
}
}
```
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