Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/5309#discussion_r27704826
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/stringOperations.scala
---
@@ -156,9 +156,9 @@ case class Lower(child: Expression) extends
UnaryExpression with CaseConversionE
/** A base trait for functions that compare two strings, returning a
boolean. */
trait StringComparison {
- self: BinaryExpression =>
+ self: BinaryPredicate =>
- type EvaluatedType = Any
+ override type EvaluatedType = Any
override def nullable: Boolean = left.nullable || right.nullable
override def dataType: DataType = BooleanType
--- End diff --
I think this `dataType` is technically redundant now.
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