02-05-2015
No. Not clear.
I don't think your grep pipe will result in what you post, as SESSION DESCRIPTIONis in line 26 while Thread is in 38.
I'd propose to look into awk to get close to what you need.
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LEARN ABOUT REDHAT
set_session_authorization
SET SESSION
AUTHORIZATION(7) SQL Commands SET SESSION AUTHORIZATION(7)
NAME
SET SESSION AUTHORIZATION - set the session user identifier and the current user identifier of the current session
SYNOPSIS
SET [ SESSION | LOCAL ] SESSION AUTHORIZATION username
SET [ SESSION | LOCAL ] SESSION AUTHORIZATION DEFAULT
RESET SESSION AUTHORIZATION
DESCRIPTION
This command sets the session user identifier and the current user identifier of the current SQL-session context to be username. The user
name may be written as either an identifier or a string literal. The session user identifier is valid for the duration of a connection;
for example, it is possible to temporarily become an unprivileged user and later switch back to become a superuser.
The session user identifier is initially set to be the (possibly authenticated) user name provided by the client. The current user identi-
fier is normally equal to the session user identifier, but may change temporarily in the context of ``setuid'' functions and similar mecha-
nisms. The current user identifier is relevant for permission checking.
The session user identifier may be changed only if the initial session user (the authenticated user) had the superuser privilege. Other-
wise, the command is accepted only if it specifies the authenticated user name.
The SESSION and LOCAL modifiers act the same as for the regular SET [set(7)] command.
The DEFAULT and RESET forms reset the session and current user identifiers to be the originally authenticated user name. These forms are
always accepted.
EXAMPLES
SELECT SESSION_USER, CURRENT_USER;
current_user | session_user
--------------+--------------
peter | peter
SET SESSION AUTHORIZATION 'paul';
SELECT SESSION_USER, CURRENT_USER;
current_user | session_user
--------------+--------------
paul | paul
COMPATIBILITY
SQL99
SQL99 allows some other expressions to appear in place of the literal username which are not important in practice. PostgreSQL allows iden-
tifier syntax ("username"), which SQL does not. SQL does not allow this command during a transaction; PostgreSQL does not make this
restriction because there is no reason to. The privileges necessary to execute this command are left implementation-defined by the stan-
dard.
SQL - Language Statements 2001-04-21 SET SESSION AUTHORIZATION(7)