Update TODO list.

doc/TODO

 TODO list for PostgreSQL
 ========================
-Last updated:		Tue Jul 20 17:40:39 EDT 1999
+Last updated:		Tue Jul 20 19:05:04 EDT 1999
 
 Current maintainer:	Bruce Momjian (maillist@candle.pha.pa.us)
 
@@ -39,6 +39,8 @@ PARSER
 * CREATE TABLE x AS SELECT 1 UNION SELECT 2 fails
 * CREATE TABLE test(col char(2) DEFAULT user) fails in length restriction
 * SELECT ... UNION ... ORDER BY fails when sort expr not in result list
+* Be smarter about promoting types when UNION merges different data types
+* SELECT ... UNION ... GROUP BY fails if column types disagree
 * redesign INSERT ... SELECT to have two levels of target list
 
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