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

    https://github.com/apache/spark/pull/13909#discussion_r92545598
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
 ---
    @@ -56,33 +58,93 @@ case class CreateArray(children: Seq[Expression]) 
extends Expression {
       }
     
       override def doGenCode(ctx: CodegenContext, ev: ExprCode): ExprCode = {
    -    val arrayClass = classOf[GenericArrayData].getName
    -    val values = ctx.freshName("values")
    -    ctx.addMutableState("Object[]", values, s"this.$values = null;")
    +    val array = ctx.freshName("array")
     
    -    ev.copy(code = s"""
    -      this.$values = new Object[${children.size}];""" +
    +    val et = dataType.elementType
    +    val evals = children.map(e => e.genCode(ctx))
    +    val isPrimitiveArray = ctx.isPrimitiveType(et)
    +    val primitiveTypeName = if (isPrimitiveArray) 
ctx.primitiveTypeName(et) else ""
    +    val (preprocess, arrayData, arrayWriter) =
    +      GenArrayData.getCodeArrayData(ctx, et, children.size, 
isPrimitiveArray, array)
    +
    +    ev.copy(code =
    +      preprocess +
           ctx.splitExpressions(
             ctx.INPUT_ROW,
    -        children.zipWithIndex.map { case (e, i) =>
    -          val eval = e.genCode(ctx)
    -          eval.code + s"""
    -            if (${eval.isNull}) {
    -              $values[$i] = null;
    +        evals.zipWithIndex.map { case (eval, i) =>
    +          eval.code +
    +            (if (isPrimitiveArray) {
    +              (if (!children(i).nullable) {
    +                s"\n$arrayWriter.write($i, ${eval.value});"
    +              } else {
    +                s"""
    +                if (${eval.isNull}) {
    +                  $arrayWriter.setNull$primitiveTypeName($i);
    +                } else {
    +                  $arrayWriter.write($i, ${eval.value});
    +                }
    +               """
    +              })
                 } else {
    -              $values[$i] = ${eval.value};
    -            }
    -           """
    +              s"""
    +              if (${eval.isNull}) {
    +                $array[$i] = null;
    +              } else {
    +                $array[$i] = ${eval.value};
    +              }
    +             """
    +            })
             }) +
    -      s"""
    -        final ArrayData ${ev.value} = new $arrayClass($values);
    -        this.$values = null;
    -      """, isNull = "false")
    +      s"\nfinal ArrayData ${ev.value} = $arrayData;\n",
    +      isNull = "false")
       }
     
       override def prettyName: String = "array"
     }
     
    +private [sql] object GenArrayData {
    +  // This function returns Java code pieces based on DataType and 
isPrimitive
    +  // for allocation of ArrayData class
    +  def getCodeArrayData(
    +      ctx: CodegenContext,
    +      dt: DataType,
    +      size: Int,
    +      isPrimitive : Boolean,
    +      array: String): (String, String, String) = {
    +    if (!isPrimitive) {
    +      val arrayClass = classOf[GenericArrayData].getName
    +      ctx.addMutableState("Object[]", array,
    +        s"this.$array = new Object[${size}];")
    +      ("", s"new $arrayClass($array)", null)
    +    } else {
    +      val holder = ctx.freshName("holder")
    +      val arrayWriter = ctx.freshName("createArrayWriter")
    +      val unsafeArrayClass = classOf[UnsafeArrayData].getName
    +      val holderClass = classOf[BufferHolder].getName
    +      val arrayWriterClass = classOf[UnsafeArrayWriter].getName
    +      ctx.addMutableState(unsafeArrayClass, array, "")
    +      ctx.addMutableState(holderClass, holder, "")
    +      ctx.addMutableState(arrayWriterClass, arrayWriter, "")
    +      val baseOffset = Platform.BYTE_ARRAY_OFFSET
    +      val unsafeArraySizeInBytes =
    +        UnsafeArrayData.calculateHeaderPortionInBytes(size) +
    +        ByteArrayMethods.roundNumberOfBytesToNearestWord(dt.defaultSize * 
size)
    +
    +      (s"""
    +        $array = new $unsafeArrayClass();
    +        $holder = new $holderClass($unsafeArraySizeInBytes);
    +        $arrayWriter = new $arrayWriterClass();
    --- End diff --
    
    @cloud-fan what do you think?


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