extract_scale

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 227
        def extract_scale(sql_type)
          case sql_type
            when /^(numeric|decimal|number)\((\d+)\)/i then 0
            when /^(numeric|decimal|number)\((\d+)(,(\d+))\)/i then $4.to_i
          end
        end