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

CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    tgl@postgresql.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.)