Changed #gsub to #sub to avoid #add_limit_offset! rewriting subquery SELECTs to include TOPs.

http://rails-sqlserver.lighthouseapp.com/projects/20277/tickets/4-subquery-select-statements-are-modified-by-add_limit_offset

Author: Erik Bryn

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -353,7 +353,7 @@ def add_limit_offset!(sql, options)
         end
         # The business of adding limit/offset
         if options[:limit] and options[:offset]
-          total_rows = select_value("SELECT count(*) as TotalRows from (#{sql.gsub(/\bSELECT(\s+DISTINCT)?\b/i, "SELECT#{$1} TOP 1000000000")}) tally").to_i
+          total_rows = select_value("SELECT count(*) as TotalRows from (#{sql.sub(/\bSELECT(\s+DISTINCT)?\b/i, "SELECT#{$1} TOP 1000000000")}) tally").to_i
           if (options[:limit] + options[:offset]) >= total_rows
             options[:limit] = (total_rows - options[:offset] >= 0) ? (total_rows - options[:offset]) : 0
           end