zhengruifeng commented on code in PR #38947:
URL: https://github.com/apache/spark/pull/38947#discussion_r1109187704
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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:
Yes, I think so
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