Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21208#discussion_r187856418
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -1468,3 +1468,149 @@ case class Flatten(child: Expression) extends
UnaryExpression {
override def prettyName: String = "flatten"
}
+
+/**
+ * Returns the array containing the given input value (left) count (right)
times.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(element, count) - Returns the array containing element
count times.",
+ examples = """
+ Examples:
+ > SELECT _FUNC_('123', 2);
+ ['123', '123']
+ """)
+case class ArrayRepeat(left: Expression, right: Expression)
+ extends BinaryExpression with ExpectsInputTypes {
+
+ private val MAX_ARRAY_LENGTH = ByteArrayMethods.MAX_ROUNDED_ARRAY_LENGTH
+
+ override def dataType: ArrayType = ArrayType(left.dataType,
left.nullable)
+
+ override def inputTypes: Seq[AbstractDataType] = Seq(AnyDataType,
IntegerType)
+
+ override def nullable: Boolean = right.nullable
+
+ override def eval(input: InternalRow): Any = {
+ val count = right.eval(input)
+ if (count == null) {
+ null
+ } else {
+ if (count.asInstanceOf[Int] > MAX_ARRAY_LENGTH) {
+ throw new RuntimeException(s"Unsuccessful try to create array with
$count elements" +
--- End diff --
nit: need a space after `elements`.
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