Github user davies commented on a diff in the pull request:

    https://github.com/apache/spark/pull/9565#discussion_r46185944
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/ScalaUDF.scala
 ---
    @@ -66,980 +85,305 @@ case class ScalaUDF(
     
       */
     
    -  // Accessors used in genCode
    -  def userDefinedFunc(): AnyRef = function
    -  def getChildren(): Seq[Expression] = children
    -
    -  private[this] val f = children.size match {
    -    case 0 =>
    -      val func = function.asInstanceOf[() => Any]
    -      (input: InternalRow) => {
    -        func()
    -      }
    -
    -    case 1 =>
    -      val func = function.asInstanceOf[(Any) => Any]
    -      val child0 = children(0)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)))
    -      }
    -
    -    case 2 =>
    -      val func = function.asInstanceOf[(Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)))
    -      }
    -
    -    case 3 =>
    -      val func = function.asInstanceOf[(Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)))
    -      }
    -
    -    case 4 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)))
    -      }
    -
    -    case 5 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)))
    -      }
    -
    -    case 6 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any) => 
Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)))
    -      }
    -
    -    case 7 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any) 
=> Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)))
    -      }
    -
    -    case 8 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)))
    -      }
    -
    -    case 9 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)))
    -      }
    -
    -    case 10 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)))
    -      }
    -
    -    case 11 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)))
    -      }
    -
    -    case 12 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)))
    -      }
    -
    -    case 13 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)))
    -      }
    -
    -    case 14 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)))
    -      }
    -
    -    case 15 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)))
    -      }
    -
    -    case 16 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      val child15 = children(15)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      lazy val converter15 = 
CatalystTypeConverters.createToScalaConverter(child15.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)),
    -          converter15(child15.eval(input)))
    -      }
    -
    -    case 17 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      val child15 = children(15)
    -      val child16 = children(16)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      lazy val converter15 = 
CatalystTypeConverters.createToScalaConverter(child15.dataType)
    -      lazy val converter16 = 
CatalystTypeConverters.createToScalaConverter(child16.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)),
    -          converter15(child15.eval(input)),
    -          converter16(child16.eval(input)))
    -      }
    -
    -    case 18 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      val child15 = children(15)
    -      val child16 = children(16)
    -      val child17 = children(17)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      lazy val converter15 = 
CatalystTypeConverters.createToScalaConverter(child15.dataType)
    -      lazy val converter16 = 
CatalystTypeConverters.createToScalaConverter(child16.dataType)
    -      lazy val converter17 = 
CatalystTypeConverters.createToScalaConverter(child17.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)),
    -          converter15(child15.eval(input)),
    -          converter16(child16.eval(input)),
    -          converter17(child17.eval(input)))
    -      }
    -
    -    case 19 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      val child15 = children(15)
    -      val child16 = children(16)
    -      val child17 = children(17)
    -      val child18 = children(18)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      lazy val converter15 = 
CatalystTypeConverters.createToScalaConverter(child15.dataType)
    -      lazy val converter16 = 
CatalystTypeConverters.createToScalaConverter(child16.dataType)
    -      lazy val converter17 = 
CatalystTypeConverters.createToScalaConverter(child17.dataType)
    -      lazy val converter18 = 
CatalystTypeConverters.createToScalaConverter(child18.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)),
    -          converter15(child15.eval(input)),
    -          converter16(child16.eval(input)),
    -          converter17(child17.eval(input)),
    -          converter18(child18.eval(input)))
    -      }
    -
    -    case 20 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      val child15 = children(15)
    -      val child16 = children(16)
    -      val child17 = children(17)
    -      val child18 = children(18)
    -      val child19 = children(19)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      lazy val converter15 = 
CatalystTypeConverters.createToScalaConverter(child15.dataType)
    -      lazy val converter16 = 
CatalystTypeConverters.createToScalaConverter(child16.dataType)
    -      lazy val converter17 = 
CatalystTypeConverters.createToScalaConverter(child17.dataType)
    -      lazy val converter18 = 
CatalystTypeConverters.createToScalaConverter(child18.dataType)
    -      lazy val converter19 = 
CatalystTypeConverters.createToScalaConverter(child19.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)),
    -          converter15(child15.eval(input)),
    -          converter16(child16.eval(input)),
    -          converter17(child17.eval(input)),
    -          converter18(child18.eval(input)),
    -          converter19(child19.eval(input)))
    -      }
    -
    -    case 21 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any) => Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      val child15 = children(15)
    -      val child16 = children(16)
    -      val child17 = children(17)
    -      val child18 = children(18)
    -      val child19 = children(19)
    -      val child20 = children(20)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      lazy val converter15 = 
CatalystTypeConverters.createToScalaConverter(child15.dataType)
    -      lazy val converter16 = 
CatalystTypeConverters.createToScalaConverter(child16.dataType)
    -      lazy val converter17 = 
CatalystTypeConverters.createToScalaConverter(child17.dataType)
    -      lazy val converter18 = 
CatalystTypeConverters.createToScalaConverter(child18.dataType)
    -      lazy val converter19 = 
CatalystTypeConverters.createToScalaConverter(child19.dataType)
    -      lazy val converter20 = 
CatalystTypeConverters.createToScalaConverter(child20.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)),
    -          converter15(child15.eval(input)),
    -          converter16(child16.eval(input)),
    -          converter17(child17.eval(input)),
    -          converter18(child18.eval(input)),
    -          converter19(child19.eval(input)),
    -          converter20(child20.eval(input)))
    -      }
    -
    -    case 22 =>
    -      val func = function.asInstanceOf[(Any, Any, Any, Any, Any, Any, Any, 
Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any, Any) => 
Any]
    -      val child0 = children(0)
    -      val child1 = children(1)
    -      val child2 = children(2)
    -      val child3 = children(3)
    -      val child4 = children(4)
    -      val child5 = children(5)
    -      val child6 = children(6)
    -      val child7 = children(7)
    -      val child8 = children(8)
    -      val child9 = children(9)
    -      val child10 = children(10)
    -      val child11 = children(11)
    -      val child12 = children(12)
    -      val child13 = children(13)
    -      val child14 = children(14)
    -      val child15 = children(15)
    -      val child16 = children(16)
    -      val child17 = children(17)
    -      val child18 = children(18)
    -      val child19 = children(19)
    -      val child20 = children(20)
    -      val child21 = children(21)
    -      lazy val converter0 = 
CatalystTypeConverters.createToScalaConverter(child0.dataType)
    -      lazy val converter1 = 
CatalystTypeConverters.createToScalaConverter(child1.dataType)
    -      lazy val converter2 = 
CatalystTypeConverters.createToScalaConverter(child2.dataType)
    -      lazy val converter3 = 
CatalystTypeConverters.createToScalaConverter(child3.dataType)
    -      lazy val converter4 = 
CatalystTypeConverters.createToScalaConverter(child4.dataType)
    -      lazy val converter5 = 
CatalystTypeConverters.createToScalaConverter(child5.dataType)
    -      lazy val converter6 = 
CatalystTypeConverters.createToScalaConverter(child6.dataType)
    -      lazy val converter7 = 
CatalystTypeConverters.createToScalaConverter(child7.dataType)
    -      lazy val converter8 = 
CatalystTypeConverters.createToScalaConverter(child8.dataType)
    -      lazy val converter9 = 
CatalystTypeConverters.createToScalaConverter(child9.dataType)
    -      lazy val converter10 = 
CatalystTypeConverters.createToScalaConverter(child10.dataType)
    -      lazy val converter11 = 
CatalystTypeConverters.createToScalaConverter(child11.dataType)
    -      lazy val converter12 = 
CatalystTypeConverters.createToScalaConverter(child12.dataType)
    -      lazy val converter13 = 
CatalystTypeConverters.createToScalaConverter(child13.dataType)
    -      lazy val converter14 = 
CatalystTypeConverters.createToScalaConverter(child14.dataType)
    -      lazy val converter15 = 
CatalystTypeConverters.createToScalaConverter(child15.dataType)
    -      lazy val converter16 = 
CatalystTypeConverters.createToScalaConverter(child16.dataType)
    -      lazy val converter17 = 
CatalystTypeConverters.createToScalaConverter(child17.dataType)
    -      lazy val converter18 = 
CatalystTypeConverters.createToScalaConverter(child18.dataType)
    -      lazy val converter19 = 
CatalystTypeConverters.createToScalaConverter(child19.dataType)
    -      lazy val converter20 = 
CatalystTypeConverters.createToScalaConverter(child20.dataType)
    -      lazy val converter21 = 
CatalystTypeConverters.createToScalaConverter(child21.dataType)
    -      (input: InternalRow) => {
    -        func(
    -          converter0(child0.eval(input)),
    -          converter1(child1.eval(input)),
    -          converter2(child2.eval(input)),
    -          converter3(child3.eval(input)),
    -          converter4(child4.eval(input)),
    -          converter5(child5.eval(input)),
    -          converter6(child6.eval(input)),
    -          converter7(child7.eval(input)),
    -          converter8(child8.eval(input)),
    -          converter9(child9.eval(input)),
    -          converter10(child10.eval(input)),
    -          converter11(child11.eval(input)),
    -          converter12(child12.eval(input)),
    -          converter13(child13.eval(input)),
    -          converter14(child14.eval(input)),
    -          converter15(child15.eval(input)),
    -          converter16(child16.eval(input)),
    -          converter17(child17.eval(input)),
    -          converter18(child18.eval(input)),
    -          converter19(child19.eval(input)),
    -          converter20(child20.eval(input)),
    -          converter21(child21.eval(input)))
    -      }
    +  private[this] val f = {
    +    lazy val inputEncoder: ExpressionEncoder[Row] = RowEncoder(inputSchema)
    +    children.size match {
    +      case 0 =>
    +        val func = function.asInstanceOf[() => Any]
    +        (input: InternalRow) => {
    +          func()
    +        }
    +
    +      case 1 =>
    +        val func = function.asInstanceOf[(Any) => Any]
    +        (input: InternalRow) => {
    +          val convertedRow: Row = inputEncoder.fromRow(input)
    +          func(convertedRow.get(0))
    --- End diff --
    
    Could we call this with reflection? Since the interpreted version is not 
used usually, don't need to worry about the performance.


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