This commit adds postgres_fdw.application_name GUC which specifies a value for application_name configuration parameter used when postgres_fdw establishes a connection to a foreign server. This GUC setting always overrides application_name option of the foreign server object. This GUC is useful when we want to specify our own application_name per remote connection.
Previously application_name of a remote connection could be set basically only via options of a server object. But which meant that every session connecting to the same foreign server basically should use the same application_name. Also if we want to change the setting, we had to execute "ALTER SERVER ... OPTIONS ..." command. It was inconvenient.
Author: Hayato Kuroda
449ab63505 postgres_fdw: Allow application_name of remote connection to be set via GUC.
contrib/postgres_fdw/connection.c | 25 ++++++--
contrib/postgres_fdw/expected/postgres_fdw.out | 79 ++++++++++++++++++++++++++
contrib/postgres_fdw/option.c | 35 +++++++++++-
contrib/postgres_fdw/postgres_fdw.h | 1 +
contrib/postgres_fdw/sql/postgres_fdw.sql | 39 +++++++++++++
doc/src/sgml/postgres-fdw.sgml | 25 ++++++++
6 files changed, 199 insertions(+), 5 deletions(-)