MXS-2508 Fix problem

DIV and MOD are now also accepted instead of / and % respectively.
MOD is a keyword but (in principle incorrectly) decays into an id
when used in some other context. That is so that it will be
parser by the general function rule ("id ( ... )"). If used
incorrectly, the server will later reject.

query_classifier/qc_sqlite/qc_sqlite.cc

@@ -929,9 +929,11 @@ public:
             case TK_BITOR:
             case TK_CASE:
             case TK_CAST:
+            case TK_DIV:
             case TK_IN:
             case TK_ISNULL:
             case TK_MINUS:
+            case TK_MOD:
             case TK_NOTNULL:
             case TK_PLUS:
             case TK_SLASH:
@@ -4011,6 +4013,9 @@ static const char* get_token_symbol(int token)
     case TK_CAST:
         return "cast";
 
+    case TK_DIV:
+        return "div";
+
     case TK_IN:
         return "in";
 
@@ -4020,6 +4025,9 @@ static const char* get_token_symbol(int token)
     case TK_MINUS:
         return "-";
 
+    case TK_MOD:
+        return "mod";
+
     case TK_NOTNULL:
         return "isnotnull";