remove useless field conversation in sql-bench

sql-bench/server-cfg.sh

@@ -251,7 +251,7 @@ sub create
   $query="create table $table_name (";
   foreach $field (@$fields)
   {
-    $field =~ s/ decimal/ double(10,2)/i;
+#    $field =~ s/ decimal/ double(10,2)/i;
     $field =~ s/ big_decimal/ double(10,2)/i;
     $query.= $field . ',';
   }