Merge mysql.com:/home/gluh/MySQL/Merge/5.1

into  mysql.com:/home/gluh/MySQL/Merge/5.1-opt


BitKeeper/etc/ignore:
  auto-union
client/mysql.cc:
  Auto merged
client/mysqltest.c:
  Auto merged
include/mysql_com.h:
  Auto merged
libmysql/CMakeLists.txt:
  Auto merged
libmysqld/lib_sql.cc:
  Auto merged
mysql-test/r/archive.result:
  Auto merged
mysql-test/r/create.result:
  Auto merged
mysql-test/r/delayed.result:
  Auto merged
mysql-test/r/func_misc.result:
  Auto merged
mysql-test/r/innodb.result:
  Auto merged
mysql-test/r/innodb_mysql.result:
  Auto merged
mysql-test/r/merge.result:
  Auto merged
mysql-test/r/ps.result:
  Auto merged
mysql-test/r/type_date.result:
  Auto merged
mysql-test/suite/rpl/r/rpl_innodb_bug28430.result:
  Auto merged
mysql-test/t/create.test:
  Auto merged
mysql-test/t/func_misc.test:
  Auto merged
mysql-test/t/information_schema.test:
  Auto merged
mysql-test/t/merge.test:
  Auto merged
mysql-test/t/subselect.test:
  Auto merged
mysql-test/t/type_date.test:
  Auto merged
mysql-test/t/type_datetime.test:
  Auto merged
mysql-test/t/variables.test:
  Auto merged
mysys/queues.c:
  Auto merged
sql/events.cc:
  Auto merged
sql/field.cc:
  Auto merged
sql/field.h:
  Auto merged
sql/ha_partition.cc:
  Auto merged
sql/handler.cc:
  Auto merged
sql/item.cc:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged
sql/item_func.h:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/opt_range.cc:
  Auto merged
sql/protocol.cc:
  Auto merged
sql/set_var.cc:
  Auto merged
sql/set_var.h:
  Auto merged
sql/slave.cc:
  Auto merged
sql/sql_class.cc:
  Auto merged
sql/sql_class.h:
  Auto merged
sql/sql_db.cc:
  Auto merged
sql/sql_insert.cc:
  Auto merged
sql/sql_parse.cc:
  Auto merged
sql/sql_partition.cc:
  Auto merged
sql/sql_plugin.cc:
  Auto merged
sql/sql_select.cc:
  Auto merged
sql/sql_string.cc:
  Auto merged
sql/sql_table.cc:
  Auto merged
sql/sql_yacc.yy:
  Auto merged
sql/table.cc:
  Auto merged
sql/table.h:
  Auto merged
storage/myisam/ha_myisam.cc:
  Auto merged
storage/myisam/mi_check.c:
  Auto merged
storage/myisam/mi_open.c:
  Auto merged
tests/mysql_client_test.c:
  Auto merged
mysql-test/lib/mtr_report.pl:
  manual merge
mysql-test/r/myisam.result:
  manual merge
mysql-test/r/partition.result:
  manual merge
mysql-test/r/user_var.result:
  manual merge
mysql-test/t/myisam.test:
  manual merge
mysql-test/t/partition.test:
  manual merge
mysql-test/t/user_var.test:
  manual merge
sql/item.h:
  manual merge
sql/item_func.cc:
  manual merge
storage/myisammrg/ha_myisammrg.cc:
  manual merge

sql/opt_range.cc

@@ -276,6 +276,9 @@ public:
   Field *field;
   uchar *min_value,*max_value;			// Pointer to range
 
+  /*
+    eq_tree() requires that left == right == 0 if the type is MAYBE_KEY.
+   */
   SEL_ARG *left,*right;   /* R-B tree children */
   SEL_ARG *next,*prev;    /* Links for bi-directional interval list */
   SEL_ARG *parent;        /* R-B tree parent */
@@ -291,7 +294,7 @@ public:
   SEL_ARG(Field *field, uint8 part, uchar *min_value, uchar *max_value,
 	  uint8 min_flag, uint8 max_flag, uint8 maybe_flag);
   SEL_ARG(enum Type type_arg)
-    :min_flag(0),elements(1),use_count(1),left(0),next_key_part(0),
+    :min_flag(0),elements(1),use_count(1),left(0),right(0),next_key_part(0),
     color(BLACK), type(type_arg)
   {}
   inline bool is_same(SEL_ARG *arg)
@@ -2161,12 +2164,18 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
   keys_to_use.intersect(head->keys_in_use_for_query);
   if (!keys_to_use.is_clear_all())
   {
+#ifndef EMBEDDED_LIBRARY                      // Avoid compiler warning
+    uchar buff[STACK_BUFF_ALLOC];
+#endif
     MEM_ROOT alloc;
     SEL_TREE *tree= NULL;
     KEY_PART *key_parts;
     KEY *key_info;
     PARAM param;
 
+    if (check_stack_overrun(thd, 2*STACK_MIN_SIZE, buff))
+      DBUG_RETURN(0);                           // Fatal error flag is set
+
     /* set up parameter that is passed to all functions */
     param.thd= thd;
     param.baseflag= head->file->ha_table_flags();