Run posts_where and posts_join only on the main query

Of course! I just had to set the $accepted_args parameter of add_filter() to 2. Like so:

add_filter('posts_join', 'my_join', 10, 2);
function my_join($join, &$query) { echo $query->is_main_query() ? 'y' : 'n'; return $join; }

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