Prevent pg_dump from dumping the comment (if any) on the 'public' schema.

This is to avoid uselessly requiring superuser permissions to restore
the dump without errors.  Pretty grotty, but no better alternative seems
available, at least not in the near term.

src/bin/pg_dump/pg_backup_archiver.c

@@ -15,7 +15,7 @@
  *
  *
  * IDENTIFICATION
- *		$PostgreSQL: pgsql/src/bin/pg_dump/pg_backup_archiver.c,v 1.151 2007/11/24 20:26:49 tgl Exp $
+ *		$PostgreSQL: pgsql/src/bin/pg_dump/pg_backup_archiver.c,v 1.152 2008/01/14 19:27:41 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -2528,11 +2528,17 @@ _printTocEntry(ArchiveHandle *AH, TocEntry *te, RestoreOptions *ropt, bool isDat
 	/*
 	 * Avoid dumping the public schema, as it will already be created ...
 	 * unless we are using --clean mode, in which case it's been deleted and
-	 * we'd better recreate it.
+	 * we'd better recreate it.  Likewise for its comment, if any.
 	 */
-	if (!ropt->dropSchema &&
-		strcmp(te->desc, "SCHEMA") == 0 && strcmp(te->tag, "public") == 0)
+	if (!ropt->dropSchema)
+	{
+		if (strcmp(te->desc, "SCHEMA") == 0 &&
+			strcmp(te->tag, "public") == 0)
+			return;
+		if (strcmp(te->desc, "COMMENT") == 0 &&
+			strcmp(te->tag, "SCHEMA public") == 0)
 			return;
+	}
 
 	/* Select owner, schema, and tablespace as necessary */
 	_becomeOwner(AH, te);