Regexp.union seems to have different results in 1.8

activerecord/test/cases/helper.rb

@@ -70,8 +70,8 @@ module ActiveRecord
 
     attr_reader :ignore
 
-    def initialize(ignore = Regexp.union(self.class.ignored_sql))
-      @ignore = ignore
+    def initialize(ignore = self.class.ignored_sql)
+      @ignore   = ignore
     end
 
     def call(name, start, finish, message_id, values)
@@ -79,7 +79,7 @@ module ActiveRecord
 
       # FIXME: this seems bad. we should probably have a better way to indicate
       # the query was cached
-      return if 'CACHE' == values[:name] || ignore =~ sql
+      return if 'CACHE' == values[:name] || ignore.any? { |x| x =~ sql }
       self.class.log << sql
     end
   end