Re: pgsql: Add relation fork support to pg_relation_size() function.

Hm, I wonder if we should have made the forks use a fork "name" instead of a
number. It sure would be nicer to have files name 12345.fsm instead of another
opaque number.

The other reason I thought of this is that if EDB or anyone else uses forks
for a private purpose then it would avoid the whole issue of conflicts. The
best option right now would be to set aside a range of values for private
purposes.

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