MDEV-13602: rocksdb.index_merge_rocksdb2 failed in buildbot

Part#2: stabilize the test output

storage/rocksdb/mysql-test/rocksdb/include/index_merge1.inc

@@ -402,12 +402,20 @@ analyze table t1;
 -- enable_query_log
 
 #  index_merge on first table in join
+if ($index_merge_random_rows_in_EXPLAIN)
+{
+  --replace_column 9 #
+}
 explain select * from t0 left join t1 on (t0.key1=t1.key1)
   where t0.key1=3 or t0.key2=4;
 
 select * from t0 left join t1 on (t0.key1=t1.key1)
   where t0.key1=3 or t0.key2=4;
 
+if ($index_merge_random_rows_in_EXPLAIN)
+{
+  --replace_column 9 #
+}
 explain
 select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3 or t0.key2=4);
 

storage/rocksdb/mysql-test/rocksdb/r/index_merge_rocksdb2.result

@@ -250,8 +250,8 @@ insert into t1 select * from t0;
 explain select * from t0 left join t1 on (t0.key1=t1.key1)
 where t0.key1=3 or t0.key2=4;
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
-1	SIMPLE	t1	ref	i1	i1	4	test.t0.key1	2	
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	#	Using union(i1,i2); Using where
+1	SIMPLE	t1	ref	i1	i1	4	test.t0.key1	#	
 select * from t0 left join t1 on (t0.key1=t1.key1)
 where t0.key1=3 or t0.key2=4;
 key1	key2	key3	key4	key5	key6	key7	key8	key1	key2	key3	key4	key5	key6	key7	key8
@@ -260,8 +260,8 @@ key1	key2	key3	key4	key5	key6	key7	key8	key1	key2	key3	key4	key5	key6	key7	key8
 explain
 select * from t0,t1 where (t0.key1=t1.key1) and ( t0.key1=3 or t0.key2=4);
 id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
-1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	2	Using union(i1,i2); Using where
-1	SIMPLE	t1	ref	i1	i1	4	test.t0.key1	2	
+1	SIMPLE	t0	index_merge	i1,i2	i1,i2	4,4	NULL	#	Using union(i1,i2); Using where
+1	SIMPLE	t1	ref	i1	i1	4	test.t0.key1	#	
 explain
 select * from t0,t1 where (t0.key1=t1.key1) and
 (t0.key1=3 or t0.key2<4) and t1.key1=2;