cloud-fan commented on a change in pull request #30297:
URL: https://github.com/apache/spark/pull/30297#discussion_r520547478
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
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@@ -231,15 +232,23 @@ case class ConcatWs(children: Seq[Expression])
*/
// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "_FUNC_(n, input1, input2, ...) - Returns the `n`-th input, e.g.,
returns `input2` when `n` is 2.",
+ usage = """
+ _FUNC_(n, input1, input2, ...) - Returns the `n`-th input, e.g., returns
`input2` when `n` is 2.
+ If the index exceeds the length of the array, Returns NULL if Ansi mode is
off;
Review comment:
ditto, Ansi -> ANSI
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