How to find bucket size from N1Q1

When I am using client auth mandatory all rest services blocked and not able to fetch disk used for bucket. Now I want to get bucket size from N1Q1 but not getting any solution. Please suggest a solution for this problem

Thanks,

There is now easy way to get this. You should use REST API of bucket stats (or cbstats https://docs.couchbase.com/server/6.6/cli/cbstats/cbstats-all.html, ep_kv_size, ep_value_size) and get from there.
If really need N1QL same REST call can be used with N1QL CURL() function described here.

This post talks some thing hard way to get but it can take long time. Get the size of documents returned by a query, *including* attachments