Properly fix:

- the "ONLY" in FROM [ONLY] isn't hashed
- the agglevelsup field in GROUPING isn't hashed
- WITH TIES not being hashed (new in PG 13)
- "DISTINCT" in "GROUP BY [DISTINCT]" isn't hashed (new in PG 14)

Reported-by: Julien Rouhaud

Discussion: https://postgr.es/m/20210425081119.ulyzxqz23ueh3wuj@nol