HiRDB hasn't equivalents for NUMTODSINTERVAL function. SQLWays leaves it as is and adds message /* SQLWays: Could not convert 'NUMTODSINTERVAL' */.

Oracle:

select numtodsinterval(99,'day') from t;

HiRDB:

select numtodsinterval(99,'day') from t;
/* SQLWays: Could not convert 'numtodsinterval' */