int is long, select column can be function, some fixes..

just to get it work.. needs improvement

lexer.cpp

@@ -198,6 +198,9 @@ namespace usql {
 	    if (token == "load")
 		    return TokenType::keyword_load;
 
+	    if (token == "save")
+		    return TokenType::keyword_save;
+
 	    if (token == "not")
 		    return TokenType::keyword_not;
 
@@ -362,6 +365,9 @@ namespace usql {
 		    case TokenType::keyword_load:
 			    txt = "load";
 			    break;
+		    case TokenType::keyword_save:
+			    txt = "save";
+			    break;
 		    case TokenType::keyword_not:
 			    txt = "not";
 			    break;