Update extension lookup routines to use the syscache
The following routines are changed to use the syscache entries added for
pg_extension in
490f869d92e5:
- get_extension_oid()
- get_extension_name()
- get_extension_schema()
A catalog scan is costly and could easily lead to a noticeable
performance impact when called once or more per query, so this is going
to be helpful for developers for extension data lookups.
Author: Andrei Lepikhov
Reviewed-by: Jelte Fennema-Nio
Discussion: https://postgr.es/m/
529295b2-6ba9-4dae-acd1-
20a9c6fb8f9a@gmail.com