Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/6405#discussion_r31394977 --- 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 -- talked to @marmbrus -- since it is named with a "verb", and might be expensive, let's keep the parentheses here for now.
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