pgsql-server/ oc/src/sgml/protocol.sgml oc/src ...

CVSROOT: /cvsroot
Module name: pgsql-server
Changes by: tgl(at)postgresql(dot)org 03/04/25 15:45:10

Modified files:
doc/src/sgml : protocol.sgml
doc/src/sgml/ref: set.sgml show.sgml
src/backend/access/transam: xlog.c
src/backend/commands: variable.c
src/backend/utils/init: postinit.c
src/backend/utils/misc: guc.c
src/include/commands: variable.h
src/include/libpq: pqcomm.h
src/include/utils: guc.h
src/interfaces/libpq: fe-connect.c fe-exec.c libpq-int.h

Log message:
In the continuing saga of FE/BE protocol revisions, add reporting of
initial values and runtime changes in selected parameters. This gets
rid of the need for an initial 'select pg_client_encoding()' query in
libpq, bringing us back to one message transmitted in each direction
for a standard connection startup. To allow server version to be sent
using the same GUC mechanism that handles other parameters, invent the
concept of a never-settable GUC parameter: you can 'show server_version'
but it's not settable by any GUC input source. Create 'lc_collate' and
'lc_ctype' never-settable parameters so that people can find out these
settings without need for pg_controldata. (These side ideas were all
discussed some time ago in pgsql-hackers, but not yet implemented.)