SQL: incorrect interval reading with more than 3 fractional second digits

The interval parsing yields incorrect results when fractional second part is on more than 3 digits:
```
sql> select interval -'22 22:21:20.19182' day to second;
INTERVAL '22 22:21:20.19182' DAY TO SECOND
------------------------------------------
PT-550H-21M-39.182S
```

instead of expected result: `PT-550H-21M-20.191S`.