SQLServer NULL defaults not always handled correctly. Closes 10257. [mikewoodhouse]

git-svn-id: http://dev.rubyonrails.org/svn/rails/adapters/sqlserver@8241 5ecf4fe2-1ee6-0310-87b1-e25e094e27de

Author: lawrence

lib/active_record/connection_adapters/sqlserver_adapter.rb

@@ -287,7 +287,7 @@ def columns(table_name, name = nil)
         #result = @connection.select_all(sql)
         columns = []
         result.each do |field|
-          default = field[:DefaultValue].to_s.gsub!(/[()\']/,"") =~ /null/ ? nil : field[:DefaultValue]
+          default = field[:DefaultValue].to_s.gsub!(/[()\']/,"") =~ /null/i ? nil : field[:DefaultValue]
           if field[:ColType] =~ /numeric|decimal/i
             type = "#{field[:ColType]}(#{field[:numeric_precision]},#{field[:numeric_scale]})"
           else