[HACKERS] What default is - SET behavior

[Zdenek Kotala]

I'm interesting in problem "Allow commenting of variables in postgresql.conf to restore them to defaults".  And I need some clarify of SET command behavior. Res_value is defined  in the source code as highest overriding setting during startup (or reconfiguration) and it is used for store "default" value. Hovewer documentation of SET command (http://www.postgresql.org/docs/8.1/interactive/sql-set.html) talk about "DEFAULT can be used to specify resetting the parameter to its default value." And there is question what is the meaning of "default value".  Because I understood "default" like value coded in source code - mentioned in the postgresql.conf.  Thanks Zdenek