Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/13909#discussion_r92108007
--- 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}) {
--- End diff --
I think branch prediction can work very well for this case, we don't need
to manually optimize the code.
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