A bug of psql completion

Hello.

I noticed that the psql completion code for "ALTER TABLE x ALTER
[COLUMN] x DROP" is wrong. It works as the following

=# alter table x alter x drop <tab>
[nothing suggested]
=# alter table x table x alter x drop <tab>
DEFAULT   NOT NULL  

The attached patch fixes it.

-- 
Kyotaro Horiguchi
NTT Open Source Software Center
diff --git a/src/bin/psql/tab-complete.c b/src/bin/psql/tab-complete.c
index b556c00..6aa3f20 100644
--- a/src/bin/psql/tab-complete.c
+++ b/src/bin/psql/tab-complete.c
@@ -1804,7 +1804,7 @@ psql_completion(const char *text, int start, int end)        COMPLETE_WITH_LIST4("PLAIN",
"EXTERNAL","EXTENDED", "MAIN");    /* ALTER TABLE ALTER [COLUMN] <foo> DROP */    else if (Matches7("ALTER", "TABLE",
MatchAny,"ALTER", "COLUMN", MatchAny, "DROP") ||
 
-             Matches8("ALTER", "TABLE", MatchAny, "TABLE", MatchAny, "ALTER", MatchAny, "DROP"))
+             Matches6("ALTER", "TABLE", MatchAny, "ALTER", MatchAny, "DROP"))        COMPLETE_WITH_LIST2("DEFAULT",
"NOTNULL");    else if (Matches4("ALTER", "TABLE", MatchAny, "CLUSTER"))        COMPLETE_WITH_CONST("ON");