Provided by: postgres-xc-client_1.1-2ubuntu2_amd64 

NAME
CREATE_USER_MAPPING - define a new mapping of a user to a foreign server
SYNOPSIS
CREATE USER MAPPING FOR { user_name | USER | CURRENT_USER | PUBLIC }
SERVER server_name
[ OPTIONS ( option 'value' [ , ... ] ) ]
DESCRIPTION
Note
The following description applies only to Postgres-XC
USER MAPPING has not been supported by Postgres-XC yet. This command may be supported in the future
releases.
Postgres-XC 1.1 2014-04-07 CREATE USER MAPPING(7)