EXPLAIN CACHES doesn't reflect changes to fallback behavior

[ayymart]

If you cache a query:

CREATE CACHE FROM SELECT * FROM t WHERE c=1;

And then re-cache it, modifying the above statement to disallow fallback to upstream:

CREATE CACHE ALWAYS FROM SELECT * FROM t WHERE c=1;

Then the output of SHOW CACHES contains no fallback as expected, but the output of EXPLAIN CACHES doesn't include ALWAYS.

Also, after doing the above, if you DROP CACHE and recreate the cache using ALWAYS, you will see two copies of the same query in EXPLAIN CACHES.