Fix test results that may change from run to run

Added comments (from code review on pull)

1 files changed, 2 insertions, 0 deletions

diff --git a/mysql-test/t/heap.test b/mysql-test/t/heap.test
index 31b7f997519..6353cd78d6a 100644
--- a/mysql-test/t/heap.test
+++ b/mysql-test/t/heap.test
@@ -360,6 +360,8 @@ explain select count(*) from t1 where v between 'a' and 'a ' and v between 'a  '
 --error 1062
 alter table t1 add unique(v);
 select concat('*',v,'*',c,'*',t,'*') as qq from t1 where v='a' order by length(concat('*',v,'*',c,'*',t,'*'));
+# Number of rows is not constant for b-trees keys
+--replace_column 9 #
 explain select * from t1 where v='a';
 
 drop table t1;