Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18228#discussion_r126340190
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -1199,6 +1199,82 @@ case class Substring(str: Expression, pos:
Expression, len: Expression)
}
/**
+ * Returns the rightmost n characters from the string.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(str, len) - Returns the rightmost `len` characters from
the string `str`.",
+ extended = """
+ Examples:
+ > SELECT _FUNC_('Spark SQL', 3);
+ SQL
+ """)
+case class Right(str: Expression, len: Expression)
+ extends BinaryExpression with ImplicitCastInputTypes with NullIntolerant
{
--- End diff --
shall we use `RuntimeReplaceable`? I think both left and right can be
implemented by substring
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