Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/6405#discussion_r31394755
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
---
@@ -86,12 +86,20 @@ abstract class Expression extends TreeNode[Expression] {
case (i1, i2) => i1 == i2
}
}
+
+ /**
+ * Check the input data types, returns `TypeCheckResult.success` if it's
valid,
+ * or return a `TypeCheckResult` with an error message if invalid.
+ * TODO: we should remove the default implementation and implement it
for all
+ * expressions with proper error message.
+ */
+ def checkInputDataTypes(): TypeCheckResult = TypeCheckResult.success
--- End diff --
I think @rxin may have asked for this, but why `()`. Isn't this function
pure?
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