Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18019#discussion_r117835357
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -1268,6 +1268,51 @@ case class Ascii(child: Expression) extends
UnaryExpression with ImplicitCastInp
}
/**
+ * Returns the ASCII character having the binary equivalent to n.
+ * If n is larger than 256 the result is equivalent to chr(n % 256)
+ */
+// scalastyle:off line.size.limit
+@ExpressionDescription(
+ usage = "_FUNC_(expr) - Returns the ASCII character having the binary
equivalent to `expr`. If n is larger than 256 the result is equivalent to chr(n
% 256)",
--- End diff --
Also add one more point here. `Invalid code points are not validated.`
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