Page intersections between a reference actor and a ban evasion source and their socks

This query is marked as a draft This query has been published by Sean.hoyland.
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-- Page intersections between a reference actor and a ban evasion source i.e. a sockmaster and their logged and/or categorized socks.
-- Edit counts for the ban evasion source and their sock accounts are summed.
-- The query gets the actor_ids for the sockmaster, accounts categorized as suspected or confirmed socks of the sockmaster
-- and accounts where relevant block log entries include the sockmaster. Inconsistencies in the way socks are logged and categorized
-- means that the set of ban evading accounts for a given ban evasion source may be incomplete. The sockmaster AndresHerutJaim is an
-- example where this is the case.  

-- NOTE: It would seem to be more elegant and efficient to place the 3 queries that select the actor_id values
-- for the sockmaster and their socks in a single CTE with unions, then make a single join to the revision_userindex view, 
-- but this appears to cause the server to mysteriously choose an inefficient execution plan. Directly joining as a subquery
-- rather than using a CTE doesn't help either.

-- Separating the sock queries and joins to the revisions into individual CTEs, then unioning those result sets in a separate CTE,
-- somewhat counterintuitively appears to help the server choose a better execution plan.

-- Reference account to be compared with the ban evasion set.
set @x = 'Huldra'; 

-- sockmaster - ban evasion account operator label used in SPI/logs/category graph, not always the oldest account.
set @y = 'Icewhiz';

-- the query - single quotes need to be escaped either by doubling or backslash
set @q = '
-- y1socks = the sockmaster
with y1socks as (
select actor_id from actor_user where actor_name = ?
),
-- y2socks = socks from the category graph
y2socks as (
select
a.actor_id
from
categorylinks cl
join page p on cl_from = p.page_id
join category cat on cl.cl_to = cat.cat_title
join actor_user a on a.actor_name = replace(p.page_title,''_'','' '')
where
cl.cl_to like ''%Wikipedia_sockpuppets_of_%''
and
cl.cl_to like concat(''%'',?)
),
-- y3socks = socks from the block log comments
y3socks as (
select
a.actor_id
from actor_user a
join ipblocks b on a.actor_user = b.ipb_user
join comment_ipblocks c on b.ipb_reason_id = c.comment_id
where
convert(c.comment_text using utf8mb4) rlike ''(checkuser|sock|multiple accounts|evasion|proxy)''
and convert(c.comment_text using utf8mb4) like concat(''%'',?,''%'')
),
xrev as (
	select ''x'' actor, ru.rev_page, count(*) editcount
	from actor_user au
	join revision_userindex ru on au.actor_id = ru.rev_actor and au.actor_name = ?
	group by 2
),
y1rev as (
	select ''y'', ru.rev_page, count(*) editcount 
	from y1socks
	join revision_userindex ru on y1socks.actor_id = ru.rev_actor
	group by 2
),
y2rev as (
	select ''y'', ru.rev_page, count(*) editcount 
	from y2socks
	join revision_userindex ru on y2socks.actor_id = ru.rev_actor
	group by 2
),
y3rev as (
	select ''y'', ru.rev_page, count(*) editcount 
	from y3socks
	join revision_userindex ru on y3socks.actor_id = ru.rev_actor
	group by 2
),
yrev as (select * from y1rev union select * from y2rev union select * from y3rev)
select 
	xrev.rev_page, 
	convert(replace(p.page_title,''_'','' '') using utf8mb4) page_title, 
	p.page_namespace, 
	case
	when p.page_namespace = 0 then ''(Main/Article)''
	when p.page_namespace = 1 then ''Talk''
	when p.page_namespace = 2 then ''User''
	when p.page_namespace = 3 then ''User talk''
	when p.page_namespace = 4 then ''Wikipedia''
	when p.page_namespace = 5 then ''Wikipedia talk''
	when p.page_namespace = 6 then ''File''
	when p.page_namespace = 7 then ''File talk''
	when p.page_namespace = 8 then ''MediaWiki''
	when p.page_namespace = 9 then ''MediaWiki talk''
	when p.page_namespace = 10 then ''Template''
	when p.page_namespace = 11 then ''Template talk''
	when p.page_namespace = 12 then ''Help''
	when p.page_namespace = 13 then ''Help talk''
	when p.page_namespace = 14 then ''Category''
	when p.page_namespace = 15 then ''Category talk''
	when p.page_namespace = 100 then ''Portal''
	when p.page_namespace = 101 then ''Portal talk''
	when p.page_namespace = 118 then ''Draft''
	when p.page_namespace = 119 then ''Draft talk''
	when p.page_namespace = 710 then ''TimedText''
	when p.page_namespace = 711 then ''TimedText talk''
	when p.page_namespace = 828 then ''Module''
	when p.page_namespace = 829 then ''Module talk''
	else null
	end as namespace_desc, 
	case when p.page_is_redirect = 0 then ''No'' else ''Yes'' end page_is_redirect,
	xrev.editcount ''ref actor editcount'', 
	yrev.editcount ''other actor(s) editcount summed'' 
from xrev
join yrev on xrev.rev_page = yrev.rev_page
join page p on xrev.rev_page = p.page_id
order by 2,3';

-- build the statement, execute, deallocate
prepare s from @q;
execute s using @y, @y, @y, @x;
deallocate prepare s;
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