Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/7034#discussion_r33340637
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -293,20 +294,118 @@ case class Substring(str: Expression, pos:
Expression, len: Expression)
}
/**
- * A function that return the length of the given string expression.
+ * A function that return the length of the given string or binary
expression.
*/
-case class StringLength(child: Expression) extends UnaryExpression with
ExpectsInputTypes {
+case class Length(child: Expression) extends UnaryExpression with
ExpressionConstraint {
override def dataType: DataType = IntegerType
- override def expectedChildTypes: Seq[DataType] = Seq(StringType)
+ def constraint: Seq[DataTypeConstraint] =
+ DataTypeConstraint(AcceptSpecifiedType(Set(StringType, BinaryType)))
:: Nil
--- End diff --
Does hive length support `ArrayType`?
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