It would also be handy if users could see their own pg_stat_activity

queries while the rest remain blank.

Kevin Brown

doc/src/sgml/monitoring.sgml

 <!--
-$Header: /cvsroot/pgsql/doc/src/sgml/monitoring.sgml,v 1.16 2003/03/20 03:34:55 momjian Exp $
+$Header: /cvsroot/pgsql/doc/src/sgml/monitoring.sgml,v 1.17 2003/03/20 18:51:16 momjian Exp $
 -->
 
 <chapter id="monitoring">
@@ -212,9 +212,10 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
       data on the current query are only available if the
       <varname>STATS_COMMAND_STRING</varname> configuration option has
       been enabled. Furthermore, these columns can only be accessed by
-      superusers; to other users, they always appear NULL. (Note that
-      because of the collector's reporting delay, current query will
-      only be up-to-date for long-running queries.)</entry>
+      superusers; or when the user examining the view is the same as the user
+      in the row; for others it reads as null.  (Note that because of the 
+      collector's reporting delay, current query will only be up-to-date for 
+      long-running queries.)</entry>
      </row>
 
      <row>
@@ -534,7 +535,8 @@ postgres: <replaceable>user</> <replaceable>database</> <replaceable>host</> <re
       <entry><type>text</type></entry>
       <entry>
        Current query of backend process (NULL if caller is not
-       superuser, or <varname>STATS_COMMAND_STRING</varname> is not enabled)
+       superuser, or is the same user as that of the backend being queried,
+       or <varname>STATS_COMMAND_STRING</varname> is not enabled)
       </entry>
      </row>
 

src/backend/utils/adt/pgstatfuncs.c

@@ -284,14 +284,14 @@ pg_stat_get_backend_activity(PG_FUNCTION_ARGS)
 	int			len;
 	text	   *result;
 
-	if (!superuser())
-		PG_RETURN_NULL();
-
 	beid = PG_GETARG_INT32(0);
 
 	if ((beentry = pgstat_fetch_stat_beentry(beid)) == NULL)
 		PG_RETURN_NULL();
 
+	if (!superuser() && beentry->userid != GetUserId())
+		PG_RETURN_NULL();
+
 	len = strlen(beentry->activity);
 	result = palloc(VARHDRSZ + len);
 	VARATT_SIZEP(result) = VARHDRSZ + len;