Github user mn-mikke commented on a diff in the pull request:
https://github.com/apache/spark/pull/21208#discussion_r185534457
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala
---
@@ -1229,3 +1229,98 @@ 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 {
+
+ override def dataType: ArrayType = ArrayType(left.dataType,
left.nullable)
+
+ override def checkInputDataTypes(): TypeCheckResult = {
+ val expected = IntegerType
+ if (!expected.acceptsType(right.dataType)) {
+ val mismatch = s"argument 2 requires ${expected.simpleString} type,
" +
+ s"however, '${right.sql}' is of ${right.dataType.simpleString}
type."
+ TypeCheckResult.TypeCheckFailure(mismatch)
+ } else {
+ TypeCheckResult.TypeCheckSuccess
+ }
+ }
+
+ override def nullable: Boolean = false
--- End diff --
What about cases when `right` is evaluated to `null`?
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