Github user 10110346 commented on a diff in the pull request: https://github.com/apache/spark/pull/18228#discussion_r126325282 --- 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 -- OK, thanks
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