relaxed DBUG_ASSERT in Item_int_with_ref::new_item() to "any constant" (BUG#10020)

mysql-test/r/subselect.result:
  test fro bug 10020
mysql-test/t/subselect.test:
  bug 10020 test suite
sql/item.cc:
  any constant allowed here BUG#10020)
BitKeeper/etc/logging_ok:
  Logging to logging@openlogging.org accepted

BitKeeper/etc/logging_ok

@@ -29,6 +29,7 @@ bar@gw.udmsearch.izhnet.ru
 bar@mysql.com
 bar@noter.intranet.mysql.r18.ru
 bell@51.0.168.192.in-addr.arpa
+bell@book.sanja.is.com.ua
 bell@laptop.sanja.is.com.ua
 bell@sanja.is.com.ua
 bk@admin.bk

mysql-test/r/subselect.result

@@ -2697,3 +2697,27 @@ select (1,2,3) = (select * from t1);
 ERROR 21000: Operand should contain 3 column(s)
 select (select * from t1) = (1,2,3);
 ERROR 21000: Operand should contain 2 column(s)
+drop table t1
+#;
+CREATE TABLE `t1` (
+`itemid` bigint(20) unsigned NOT NULL auto_increment,
+`sessionid` bigint(20) unsigned default NULL,
+`time` int(10) unsigned NOT NULL default '0',
+`type` set('A','D','E','F','G','I','L','N','U') collate latin1_general_ci NOT
+NULL default '',
+`data` text collate latin1_general_ci NOT NULL,
+PRIMARY KEY  (`itemid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t1` VALUES (1, 1, 1, 'D', '');
+CREATE TABLE `t2` (
+`sessionid` bigint(20) unsigned NOT NULL auto_increment,
+`pid` int(10) unsigned NOT NULL default '0',
+`date` int(10) unsigned NOT NULL default '0',
+`ip` varchar(15) collate latin1_general_ci NOT NULL default '',
+PRIMARY KEY  (`sessionid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t2` VALUES (1, 1, 1, '10.10.10.1');
+SELECT s.ip, count( e.itemid ) FROM `t1` e JOIN t2 s ON s.sessionid = e.sessionid WHERE e.sessionid = ( SELECT sessionid FROM t2 ORDER BY sessionid DESC LIMIT 1 ) GROUP BY s.ip HAVING count( e.itemid ) >0 LIMIT 0 , 30;
+ip	count( e.itemid )
+10.10.10.1	1
+drop tables t1,t2;

mysql-test/t/subselect.test

@@ -1722,3 +1722,27 @@ select (1,2,3) = (select * from t1);
 -- error 1241
 select (select * from t1) = (1,2,3);
 drop table t1
+
+#
+# Item_int_with_ref check (BUG#10020)
+#
+CREATE TABLE `t1` (
+  `itemid` bigint(20) unsigned NOT NULL auto_increment,
+  `sessionid` bigint(20) unsigned default NULL,
+  `time` int(10) unsigned NOT NULL default '0',
+  `type` set('A','D','E','F','G','I','L','N','U') collate latin1_general_ci NOT
+NULL default '',
+  `data` text collate latin1_general_ci NOT NULL,
+  PRIMARY KEY  (`itemid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t1` VALUES (1, 1, 1, 'D', '');
+CREATE TABLE `t2` (
+  `sessionid` bigint(20) unsigned NOT NULL auto_increment,
+  `pid` int(10) unsigned NOT NULL default '0',
+  `date` int(10) unsigned NOT NULL default '0',
+  `ip` varchar(15) collate latin1_general_ci NOT NULL default '',
+  PRIMARY KEY  (`sessionid`)
+) DEFAULT CHARSET=latin1 COLLATE=latin1_general_ci;
+INSERT INTO `t2` VALUES (1, 1, 1, '10.10.10.1');
+SELECT s.ip, count( e.itemid ) FROM `t1` e JOIN t2 s ON s.sessionid = e.sessionid WHERE e.sessionid = ( SELECT sessionid FROM t2 ORDER BY sessionid DESC LIMIT 1 ) GROUP BY s.ip HAVING count( e.itemid ) >0 LIMIT 0 , 30;
+drop tables t1,t2;

sql/item.cc

@@ -2034,7 +2034,7 @@ bool Item_int::eq(const Item *arg, bool binary_cmp) const
 
 Item *Item_int_with_ref::new_item()
 {
-  DBUG_ASSERT(ref->basic_const_item());
+  DBUG_ASSERT(ref->const_item());
   /*
     We need to evaluate the constant to make sure it works with
     parameter markers.