Github user javadba commented on a diff in the pull request: https://github.com/apache/spark/pull/1586#discussion_r15547795 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala --- @@ -209,6 +212,82 @@ case class EndsWith(left: Expression, right: Expression) } /** + * A function that returns the number of bytes in an expression + */ +case class Length(child: Expression) extends UnaryExpression { + + type EvaluatedType = Any + + override def dataType = IntegerType + + override def foldable = child.foldable + + override def nullable = child.nullable + + override def toString = s"Length($child)" + + override def eval(input: Row): EvaluatedType = { + val string = child.eval(input) + if (string == null) { + null + } else if (!string.isInstanceOf[String]) { + string.toString.length + } else { + new String(string.toString.getBytes, StrlenConstants.DefaultEncoding).length + } + } + +} + +object StrlenConstants { + val DefaultEncoding = "ISO-8859-1" +} + +/** + * A function that returns the number of characters in a string expression + */ +case class Strlen(child: Expression, encoding : Expression) extends UnaryExpression + with Logging { + + type EvaluatedType = Any + + override def dataType = IntegerType + + override def foldable = child.foldable + + override def nullable = true + + override def toString = s"Strlen($child, $encoding)" + + override def eval(input: Row): EvaluatedType = { + val string = child.eval(input) + if (string == null) { + null + } else if (!string.isInstanceOf[String]) { + log.debug(s"Non-string value [$string] provided to strlen") + null + } else { + var evalEncoding = encoding.eval(input) + val strEncoding = + if (evalEncoding != null) { + evalEncoding.toString + } else { + StrlenConstants.DefaultEncoding + } + val s: String = "" + try { + new String(string.asInstanceOf[String].getBytes, strEncoding).length + } catch { + case ue : UnsupportedEncodingException => { + log.debug(s"strlen: Caught UnsupportedEncodingException for encoding=[$strEncoding]") --- End diff -- I am fine to throw an exception in these two cases: it was suggested by one of the reviewers to send null instead. personally as a developer of an app using the api I would likely consider it to be a bug that an encoding were incorrect so the exception makes more sense. So we have t
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