navinvishy commented on code in PR #38947:
URL: https://github.com/apache/spark/pull/38947#discussion_r1042620296
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala:
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@@ -1399,6 +1399,119 @@ 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 NullIntolerant
+ with QueryErrorsBase {
+
+ 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 = {
+ nullSafeCodeGen(
+ ctx,
+ ev,
+ (arr, value) => {
+ 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)
+ 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
+ })
+ }
+
+ 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
+ override def checkInputDataTypes(): TypeCheckResult = {
Review Comment:
I did what `ArrayContains` does. Maybe we should consolidate this, since it
makes sense for many of these to do the same thing? eg. `ArrayContains`,
`ArrayRemove`, `ArrayPrepend`, `ArrayAppend` etc.
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