add todo

apache · Jun 1, 2015 · 39929d9 · 39929d9
1 parent 0808fd2
commit 39929d9
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala b/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala
@@ -90,6 +90,8 @@ abstract class Expression extends TreeNode[Expression] {
   /**
    * 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
 }