zhengruifeng commented on code in PR #38947:
URL: https://github.com/apache/spark/pull/38947#discussion_r1105246370
##########
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala:
##########
@@ -1399,6 +1399,149 @@ case class ArrayContains(left: Expression, right:
Expression)
copy(left = newLeft, right = newRight)
}
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage =
+ "_FUNC_(array, value) - Returns an array containing value as well as all
elements from array. The new element is positioned at the beginning of the
array.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_(array(1, 2, 3), 4);
+ [4, 1, 2, 3]
+ """,
+ group = "array_funcs",
+ since = "3.4.0")
+case class ArrayPrepend(left: Expression, right: Expression)
+ extends BinaryExpression
+ with ImplicitCastInputTypes
+ with ComplexTypeMergingExpression
+ with QueryErrorsBase {
+
+ override def nullable: Boolean = left.nullable
+
+ override def eval(input: InternalRow): Any = {
+ val value1 = left.eval(input)
+ if (value1 == null) {
+ null
+ } else {
+ val value2 = right.eval(input)
+ nullSafeEval(value1, value2)
+ }
+ }
+ override def nullSafeEval(arr: Any, value: Any): Any = {
+ val numberOfElements = arr.asInstanceOf[ArrayData].numElements()
+ if (numberOfElements + 1 > ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH) {
+ throw
QueryExecutionErrors.concatArraysWithElementsExceedLimitError(numberOfElements)
+ }
+ val newArray = new Array[Any](numberOfElements + 1)
+ newArray(0) = value
+ var pos = 1
+ arr
+ .asInstanceOf[ArrayData]
+ .foreach(
+ right.dataType,
+ (i, v) => {
+ newArray(pos) = v
+ pos += 1
+ })
+ new GenericArrayData(newArray)
+ }
+ override protected def doGenCode(ctx: CodegenContext, ev: ExprCode):
ExprCode = {
+ val leftGen = left.genCode(ctx)
+ val rightGen = right.genCode(ctx)
+ val f = (arr: String, value: String) => {
+ val newArraySize = ctx.freshName("newArraySize")
+ val newArray = ctx.freshName("newArray")
+ val i = ctx.freshName("i")
+ val pos = ctx.freshName("pos")
+ val allocation = CodeGenerator.createArrayData(
+ newArray,
+ right.dataType,
+ newArraySize,
+ s" $prettyName failed.")
+ val assignment =
+ CodeGenerator.createArrayAssignment(newArray, right.dataType, arr,
pos, i, false)
+ val newElemAssignment =
+ CodeGenerator.setArrayElement(newArray, right.dataType, pos, value,
Some(rightGen.isNull))
+ s"""
+ |int $pos = 0;
+ |int $newArraySize = $arr.numElements() + 1;
+ |$allocation
+ |$newElemAssignment
+ |$pos = $pos + 1;
+ |for (int $i = 0; $i < $arr.numElements(); $i ++) {
+ | $assignment
+ | $pos = $pos + 1;
+ |}
+ |${ev.value} = $newArray;
+ |""".stripMargin
+ }
+ val resultCode = f(leftGen.value, rightGen.value)
+ if(nullable) {
+ val nullSafeEval = leftGen.code + rightGen.code +
ctx.nullSafeExec(nullable, leftGen.isNull) {
+ s"""
+ |${ev.isNull} = false;
+ |${resultCode}
+ |""".stripMargin
+ }
+ ev.copy(code =
+ code"""
+ boolean ${ev.isNull} = true;
+ ${CodeGenerator.javaType(dataType)} ${ev.value} =
${CodeGenerator.defaultValue(dataType)};
+ $nullSafeEval
+ """)
+ } else {
+ ev.copy(code =
+ code"""
+ ${leftGen.code}
+ ${rightGen.code}
+ ${CodeGenerator.javaType(dataType)} ${ev.value} =
${CodeGenerator.defaultValue(dataType)};
+ $resultCode""", isNull = FalseLiteral)
+ }
+ }
+
+ override def prettyName: String = "array_prepend"
+
+ override protected def withNewChildrenInternal(
+ newLeft: Expression, newRight: Expression): ArrayPrepend =
+ copy(left = newLeft, right = newRight)
+
+ override def dataType: DataType = left.dataType
Review Comment:
see
https://github.com/apache/spark/commit/718b6b7ed8277d5f6577367ab0d49f60f9777df7
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: [email protected]
For queries about this service, please contact Infrastructure at:
[email protected]
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
