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

    https://github.com/apache/spark/pull/13909#discussion_r93814699
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
 ---
    @@ -56,33 +58,81 @@ 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.$values = null;")
    -
    -    ev.copy(code = s"""
    -      this.$values = new Object[${children.size}];""" +
    -      ctx.splitExpressions(
    -        ctx.INPUT_ROW,
    -        children.zipWithIndex.map { case (e, i) =>
    -          val eval = e.genCode(ctx)
    -          eval.code + s"""
    -            if (${eval.isNull}) {
    -              $values[$i] = null;
    -            } else {
    -              $values[$i] = ${eval.value};
    -            }
    -           """
    -        }) +
    -      s"""
    -        final ArrayData ${ev.value} = new $arrayClass($values);
    -        this.$values = null;
    -      """, isNull = "false")
    +    val array = ctx.freshName("array")
    +
    +    val et = dataType.elementType
    +    val evals = children.map(e => e.genCode(ctx))
    +    val isPrimitiveArray = ctx.isPrimitiveType(et)
    +    val (preprocess, arrayData) =
    +      GenArrayData.getCodeArrayData(ctx, et, children.size, 
isPrimitiveArray, array)
    +
    +    val assigns = if (isPrimitiveArray) {
    +      val primitiveTypeName = ctx.primitiveTypeName(et)
    +      evals.zipWithIndex.map { case (eval, i) =>
    +        eval.code + s"""
    +         if (${eval.isNull}) {
    +           $arrayData.setNullAt($i);
    +         } else {
    +           $arrayData.set$primitiveTypeName($i, ${eval.value});
    +         }
    +       """
    +      }
    +    } else {
    +      evals.zipWithIndex.map { case (eval, i) =>
    +        eval.code + s"""
    +         if (${eval.isNull}) {
    +           $array[$i] = null;
    +         } else {
    +           $array[$i] = ${eval.value};
    +         }
    +       """
    +      }
    +    }
    +    ev.copy(code =
    --- End diff --
    
    For now, while I did not apply this change, I left a comment as ToDo.


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