Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/13909#discussion_r93817572
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
---
@@ -56,33 +58,130 @@ 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 et = dataType.elementType
+ val evals = children.map(e => e.genCode(ctx))
+ val isPrimitiveArray = ctx.isPrimitiveType(et)
+ val (preprocess, postprocess, arrayData, array) =
+ GenArrayData.genCodeToCreateArrayData(ctx, et, children.size,
isPrimitiveArray)
+ val assigns = GenArrayData.genCodeToAssignArrayElements(
+ ctx, evals, et, isPrimitiveArray, arrayData, array, true)
+ /*
+ TODO: When we generate simpler code, we have to solve the following
exception
+ https://github.com/apache/spark/pull/13909/files#r93813725
+ ev.copy(
+ code = preprocess + ctx.splitExpressions(ctx.INPUT_ROW, assigns) +
postprocess
+ value = arrayData,
+ isNull = "false")
+ */
+ ev.copy(
+ code = preprocess + ctx.splitExpressions(ctx.INPUT_ROW, assigns) +
postprocess +
+ s"\nfinal ArrayData ${ev.value} = $arrayData;\n",
+ isNull = "false")
}
override def prettyName: String = "array"
}
+private [sql] object GenArrayData {
+ /**
+ * Return Java code pieces based on DataType and isPrimitive to allocate
ArrayData class
+ *
+ * @param ctx a [[CodegenContext]]
+ * @param elementType data type of an underlying array
+ * @param numElements the number of array elements
+ * @param isPrimitive Are all of the elements of an underlying array
primitive type
+ * @return (code pre-assignments, code post-assignments, underlying
array name, arrayData name)
+ */
+ def genCodeToCreateArrayData(
+ ctx: CodegenContext,
+ elementType: DataType,
+ numElements: Int,
+ isPrimitive : Boolean): (String, String, String, String) = {
+ val arrayName = ctx.freshName("array")
+ val arrayDataName = ctx.freshName("arrayData")
+ if (!isPrimitive) {
+ val arrayClass = classOf[GenericArrayData].getName
+ ctx.addMutableState("Object[]", arrayName,
+ s"this.$arrayName = new Object[${numElements}];")
+ ("",
+ s"$arrayClass $arrayDataName = new $arrayClass($arrayName);",
+ arrayDataName,
+ arrayName)
+ } else {
+ val unsafeArrayClass = classOf[UnsafeArrayData].getName
+ val baseObject = ctx.freshName("baseObject")
+ val unsafeArraySizeInBytes =
+ UnsafeArrayData.calculateHeaderPortionInBytes(numElements) +
+
ByteArrayMethods.roundNumberOfBytesToNearestWord(elementType.defaultSize *
numElements)
+ val baseOffset = Platform.BYTE_ARRAY_OFFSET
+
+ (s"""
+ byte[] $arrayName = new byte[$unsafeArraySizeInBytes];
+ $unsafeArrayClass $arrayDataName = new $unsafeArrayClass();
--- End diff --
I think @ueshin meant the split element assignment codes won't access this
local `arrayDataName`. So you might need to use `addMutableState` to add them
in.
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