Github user 10110346 commented on a diff in the pull request:
https://github.com/apache/spark/pull/18228#discussion_r126842908
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -1199,6 +1199,49 @@ case class Substring(str: Expression, pos:
Expression, len: Expression)
}
/**
+ * Returns the rightmost n characters from the string.
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(str, len) - Returns the rightmost `len`(`len` can be
string type) characters from the string `str`,if `len` is less or equal than 0
the result is ``.",
--- End diff --
ok, thanks
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