Github user dongjoon-hyun commented on the issue:
https://github.com/apache/spark/pull/16605
Hi, @maropu .
In the current master with your example, we can do the following. How do
you think about this?
```scala
scala> import scala.collection.mutable.WrappedArray
import scala.collection.mutable.WrappedArray
scala> val testArrayUdf = udf { (ar: WrappedArray[Int]) => ar.sum }
testArrayUdf: org.apache.spark.sql.expressions.UserDefinedFunction =
UserDefinedFunction(<function1>,IntegerType,Some(List(ArrayType(IntegerType,false))))
scala> df.select(testArrayUdf($"ar")).show
+-------+
|UDF(ar)|
+-------+
| 1|
+-------+
```
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