Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/18228#discussion_r126266425
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringExpressions.scala
---
@@ -1199,6 +1199,85 @@ 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
{
+ override def left: Expression = str
+ override def right: Expression = len
+ override def dataType: DataType = str.dataType
+
+ override def inputTypes: Seq[AbstractDataType] =
+ Seq(TypeCollection(StringType, BinaryType), IntegerType)
+
+ override def nullSafeEval(string: Any, len: Any): Any = {
+ str.dataType match {
+ case StringType => string.asInstanceOf[UTF8String]
+ .substringSQL(if (len.asInstanceOf[Int] <= 0) Integer.MAX_VALUE
else -len.asInstanceOf[Int],
+ Integer.MAX_VALUE)
--- End diff --
Please change it to something like
```
val pos = xyz
val len = xyz
string.asInstanceOf[UTF8String].substringSQL(pos, len)
```
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