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: ########## @@ -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` -- 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: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org