Merge abotchkov@bk-internal.mysql.com:/home/bk/mysql-4.0

into deer.(none):/home/hf/work/mysql-4.0.674

mysql-test/r/sel000100.result

@@ -26,3 +26,13 @@ ORDER BY link;
 key_link_id	link
 NULL	NULL
 drop table t1,t2;
+CREATE TABLE t1 (
+html varchar(5) default NULL,
+rin int(11) default '0',
+out int(11) default '0'
+) TYPE=MyISAM;
+INSERT INTO t1 VALUES ('1',1,0);
+SELECT DISTINCT html,SUM(out)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
+html	prod
+1	0.00
+drop table t1;

mysql-test/t/sel000100.test

@@ -29,3 +29,18 @@ GROUP BY t1.id
 ORDER BY link;
 
 drop table t1,t2;
+
+#
+# test case for #674
+#
+CREATE TABLE t1 (
+  html varchar(5) default NULL,
+  rin int(11) default '0',
+  out int(11) default '0'
+) TYPE=MyISAM;
+
+INSERT INTO t1 VALUES ('1',1,0);
+
+SELECT DISTINCT html,SUM(out)/(SUM(rin)+1) as 'prod' FROM t1 GROUP BY rin;
+
+drop table t1;

sql/sql_select.cc

@@ -453,6 +453,9 @@ mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &fields,COND *conds,
     goto err;
 
   thd->proc_info="preparing";
+
+  select_distinct= select_distinct && (join.const_tables != join.tables);
+
   if (result->initialize_tables(&join))
     goto err;
   if (join.const_table_map != join.found_const_table_map &&