Bug #64343 Count Distinct Giving Different Results Depending on Index

Description:
If you have two count(distinct x) expressions in a query then you will get back different (incorrect) results if you have an index on both of the the distinct columns.

How to repeat:
mysql> create table test(a int, b int);
Query OK, 0 rows affected (0.14 sec)

mysql> insert into test(a,b) values(1, 1);
Query OK, 1 row affected (0.00 sec)

mysql> insert into test(a,b) values(1, 2);
Query OK, 1 row affected (0.00 sec)

mysql> insert into test(a,b) values(1, 3);
Query OK, 1 row affected (0.01 sec)

mysql> insert into test(a,b) values(1, 4);
Query OK, 1 row affected (0.00 sec)

mysql> insert into test(a,b) values(1, 5);
Query OK, 1 row affected (0.00 sec)

mysql> select SQL_NO_CACHE count(distinct a), count(distinct b) from test;
+-------------------+-------------------+
| count(distinct a) | count(distinct b) |
+-------------------+-------------------+
|                 1 |                 5 |
+-------------------+-------------------+
1 row in set (0.00 sec)

mysql> alter table test add index (a,b);
Query OK, 0 rows affected (0.12 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql> select SQL_NO_CACHE count(distinct a), count(distinct b) from test;
+-------------------+-------------------+
| count(distinct a) | count(distinct b) |
+-------------------+-------------------+
|                 5 |                 5 |
+-------------------+-------------------+
1 row in set (0.01 sec)

Looks like a duplicate of bug #62504. Please, check.

it's a duplicate of that bug