Merge weblab.(none):/home/marcsql/TREE/mysql-5.1-base

into  weblab.(none):/home/marcsql/TREE/mysql-5.1-rt-merge


include/my_pthread.h:
  Auto merged
mysql-test/mysql-test-run.pl:
  Auto merged
mysql-test/r/partition_innodb.result:
  Auto merged
mysql-test/t/disabled.def:
  Auto merged
server-tools/instance-manager/IMService.cpp:
  Auto merged
sql/ha_ndbcluster.cc:
  Auto merged
sql/ha_ndbcluster_binlog.cc:
  Auto merged
sql/ha_partition.cc:
  Auto merged
sql/handler.cc:
  Auto merged
sql/item_cmpfunc.cc:
  Auto merged
sql/item_cmpfunc.h:
  Auto merged
sql/item_subselect.cc:
  Auto merged
sql/item_subselect.h:
  Auto merged
sql/mysql_priv.h:
  Auto merged
sql/mysqld.cc:
  Auto merged
sql/set_var.cc:
  Auto merged
sql/sql_base.cc:
  Auto merged
sql/sql_class.cc:
  Auto merged
sql/sql_lex.cc:
  Auto merged
sql/sql_lex.h:
  Auto merged
sql/sql_yacc.yy:
  Auto merged
sql/table.cc:
  Auto merged

1 files changed, 7 insertions, 1 deletions

diff --git a/sql/item_cmpfunc.h b/sql/item_cmpfunc.h
index 823debbbafe..3b08036368c 100644
--- a/sql/item_cmpfunc.h
+++ b/sql/item_cmpfunc.h
@@ -1131,12 +1131,18 @@ public:
   */
   in_vector *array;
   bool have_null;
+  /* 
+    true when all arguments of the IN clause are of compatible types
+    and can be used safely as comparisons for key conditions
+  */
+  bool arg_types_compatible;
   Item_result left_result_type;
   cmp_item *cmp_items[5]; /* One cmp_item for each result type */
   DTCollation cmp_collation;
 
   Item_func_in(List<Item> &list)
-    :Item_func_opt_neg(list), array(0), have_null(0)
+    :Item_func_opt_neg(list), array(0), have_null(0),
+    arg_types_compatible(FALSE)
   {
     bzero(&cmp_items, sizeof(cmp_items));
     allowed_arg_cols= 0;  // Fetch this value from first argument