Hi,
> ```
> postgres=# alter system set autovacuum_vacuum_threshold to 2_147_483_648;
> ERROR: invalid value for parameter "autovacuum_vacuum_threshold": "2_147_483_648"
> postgres=# alter system set autovacuum_vacuum_threshold to 2_147_483_647;
> ALTER SYSTEM
> ```
>
> IIRC, the lexer only supports integers but not int64.
Right. Supporting underscores for GUCs was discussed above but not
implemented in the patch. As Alexander rightly pointed out this is not
a priority and can be discussed separately.
--
Best regards,
Aleksander Alekseev
