find_one uses prepared statement cache

activerecord/lib/active_record/base.rb

@@ -718,6 +718,7 @@ def column_methods_hash #:nodoc:
       #    end
       #  end
       def reset_column_information
+        connection.reset!
         undefine_attribute_methods
         @column_names = @columns = @columns_hash = @content_columns = @dynamic_methods_hash = @inheritance_column = nil
         @arel_engine = @relation = @arel_table = nil

activerecord/lib/active_record/relation/finder_methods.rb

@@ -288,7 +288,12 @@ def find_with_ids(*ids)
     def find_one(id)
       id = id.id if ActiveRecord::Base === id
 
-      record = where(primary_key.eq(id)).first
+      column = primary_key.column
+
+      substitute = connection.substitute_for(column, @bind_values)
+      relation = where(primary_key.eq(substitute))
+      relation.bind_values = [[column, id]]
+      record = relation.first
 
       unless record
         conditions = arel.where_sql