Index: src/bin/psql/command.c
===================================================================
--- src/bin/psql/command.c	(8.4dev 2008-08-28)
+++ src/bin/psql/command.c	(working copy)
@@ -333,6 +333,7 @@
 
 		show_verbose = strchr(cmd, '+') ? true : false;
 
+		ignore_notices = true;
 		switch (cmd[1])
 		{
 			case '\0':
@@ -418,6 +419,7 @@
 			default:
 				status = PSQL_CMD_UNKNOWN;
 		}
+		ignore_notices = false;
 
 		if (pattern)
 			free(pattern);
Index: src/bin/psql/common.c
===================================================================
--- src/bin/psql/common.c	(8.4dev 2008-08-28)
+++ src/bin/psql/common.c	(working copy)
@@ -26,8 +26,9 @@
 #include "copy.h"
 #include "mbprint.h"
 
+/* Flag to ignore backend notices (used during tab-completion) */
+bool ignore_notices = false;
 
-
 static bool ExecQueryUsingCursor(const char *query, double *elapsed_msec);
 static bool command_no_begin(const char *query);
 static bool is_select_command(const char *query);
@@ -180,7 +181,9 @@
 NoticeProcessor(void *arg, const char *message)
 {
 	(void) arg;					/* not used */
-	psql_error("%s", message);
+
+	if (!ignore_notices)
+		psql_error("%s", message);
 }
 
 
Index: src/bin/psql/common.h
===================================================================
--- src/bin/psql/common.h	(8.4dev 2008-08-28)
+++ src/bin/psql/common.h	(working copy)
@@ -63,4 +63,7 @@
 
 extern char *expand_tilde(char **filename);
 
+/* Flag to ignore backend notices (used during tab-completion) */
+extern bool ignore_notices;
+
 #endif   /* COMMON_H */
Index: src/bin/psql/tab-complete.c
===================================================================
--- src/bin/psql/tab-complete.c	(8.4dev 2008-08-28)
+++ src/bin/psql/tab-complete.c	(working copy)
@@ -2575,7 +2575,9 @@
 	if (query == NULL || !pset.db || PQstatus(pset.db) != CONNECTION_OK)
 		return NULL;
 
+	ignore_notices = true;
 	result = PQexec(pset.db, query);
+	ignore_notices = false;
 
 	if (PQresultStatus(result) != PGRES_TUPLES_OK)
 	{