Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/6405#discussion_r31107091
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -124,12 +124,45 @@ case class GroupExpression(children: Seq[Expression])
extends Expression {
override def dataType: DataType = throw new UnsupportedOperationException
}
+trait TypeConstraint {
+ self: Expression =>
+
+ def isTypeMatch: Boolean
--- End diff --
i think we should just put this in Expression itself, so every expression
has to define something related to type checking.
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