r9370: * sql/db-interface.lisp: Add new db-type-has-union?

[clsql.git] / sql / db-interface.lisp

diff --git a/sql/db-interface.lisp b/sql/db-interface.lisp
index 84702b9c940e7170c69beb23ae01d57c8e284f5e..62436309b25e550bf877a09f493c4e65d74bafdc 100644 (file)
--- a/sql/db-interface.lisp
+++ b/sql/db-interface.lisp
@@ -244,6 +244,12 @@ of TYPE_NAME (keyword) PRECISION SCALE NULLABLE."))
           t)
   (:documentation "T [default] if database-type supports boolean WHERE clause, such as 'WHERE MARRIED'."))
 
+(defgeneric db-type-has-union? (db-type)
+  (:method (db-type)
+          (declare (ignore db-type))
+          t)
+  (:documentation "T [default] if database-type supports boolean UNION."))
+
 (defgeneric db-backend-has-create/destroy-db? (db-type)
   (:method (db-type)
           (declare (ignore db-type))