Don't cache arrays of query results in a single cache bucket
|Reported by:||ryan||Owned by:|
We have started using one cache bucket per query with passive invalidation controlled through a last_changed incrementor. See #22024 for an example. We also need to do this with get_pages(), wp_get_archives(), and elsewhere. On wordpress.com we have hacked some of these into separate buckets because saving multiple queries per cache bucket results in huge buckets. We have seen 72MB get_pages caches. Let's finally clean this up for good. Some of the last_changed work done for #22176 can be used here.