zhengruifeng commented on code in PR #38947:
URL: https://github.com/apache/spark/pull/38947#discussion_r1042152011
##########
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
Review Comment:
or use `ArrayData.foreach`
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