Revert "Merge pull request #628 from jzelenkov/fix-postresql-oid"

This reverts commit 2a29613a, reversing
changes made to c5c45940.

lib/geocoder/stores/active_record.rb

@@ -194,16 +194,13 @@ module Geocoder::Store
         else
           clause = (columns || full_column_name("*"))
         end
-
-        identifierType = using_postgresql? ? "::character(255)" : ""
-
         if distance
           clause += ", " unless clause.empty?
-          clause += "'#{distance}'#{identifierType} AS #{distance_column}"
+          clause += "#{distance} AS #{distance_column}"
         end
         if bearing
           clause += ", " unless clause.empty?
-          clause += "'#{bearing}'#{identifierType} AS #{bearing_column}"
+          clause += "#{bearing} AS #{bearing_column}"
         end
         clause
       end
@@ -225,11 +222,6 @@ module Geocoder::Store
         connection.adapter_name.match(/sqlite/i)
       end
 
-      def using_postgresql?
-        connection.adapter_name.match(/postgres/i)
-      end
-
-
       ##
       # Value which can be passed to where() to produce no results.
       #