Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/21053#discussion_r181623519 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/collectionOperations.scala --- @@ -287,3 +287,106 @@ case class ArrayContains(left: Expression, right: Expression) override def prettyName: String = "array_contains" } + +/** + * Returns the value of index `right` in Array `left` or the value for key `right` in Map `left`. + */ +@ExpressionDescription( + usage = """ + _FUNC_(array, index) - Returns element of array at given index. If index < 0, accesses elements + from the last to the first. --- End diff -- nit: `Returns NULL if the index exceeds the length of the array`.
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