Merge from mysql-trunk-bugfixing.

mysql-test/t/index_merge_innodb.test

@@ -21,14 +21,10 @@ let $index_merge_random_rows_in_EXPLAIN = 1;
 # InnoDB does not support Merge tables (affects include/index_merge1.inc)
 let $merge_table_support= 0;
 
-# The first two tests are disabled because of non deterministic explain output.
-# If include/index_merge1.inc can be enabled for InnoDB and all other
-# storage engines, please remove the subtest for Bug#21277 from
-# include/index_merge2.inc.
-# This test exists already in include/index_merge1.inc.
+# -- [DISABLED Bug#45727]
 # --source include/index_merge1.inc
 # --source include/index_merge_ror.inc
+# --source include/index_merge2.inc
 
---source include/index_merge2.inc
 --source include/index_merge_2sweeps.inc
 --source include/index_merge_ror_cpk.inc