USE plato;

PRAGMA yt.JoinMergeForce = "1";
pragma yt.JoinMergeTablesLimit="10";

$join =
    SELECT a.key as key1, a.subkey as subkey1
    FROM (SELECT * FROM Input8 WHERE subkey != "bar") AS a
    JOIN (SELECT * FROM Input8 WHERE subkey != "foo") AS b
    ON a.key = b.key AND a.subkey = b.subkey;

SELECT key1, subkey1, count(*)
FROM $join
GROUP COMPACT BY subkey1, key1;

SELECT key1, subkey1
FROM $join
GROUP COMPACT BY key1, subkey1;