should be it

external/duckdb/benchmark/ldbc/queries/bi-8.sql

@@ -0,0 +1,54 @@
+/* Q8. Central Person for a Tag
+\set tag '\'Che_Guevara\''
+\set date '\'2011-07-22T00:00:00.000+00:00\''::timestamp
+ */
+WITH person_tag_interest AS (
+    SELECT p.p_personid AS personid
+      FROM person p
+         , person_tag pt
+         , tag t
+     WHERE 1=1
+        -- join
+       AND p.p_personid = pt.pt_personid
+       AND pt.pt_tagid = t.t_tagid
+        -- filter
+       AND t.t_name = 'Che_Guevara'
+)
+   , person_message_score AS (
+    SELECT p.p_personid AS personid
+         , count(*) AS message_score
+      FROM message m
+         , person p
+         , message_tag pt
+         , tag t
+     WHERE 1=1
+        -- join
+       AND m.m_creatorid = p.p_personid
+       AND m.m_messageid = pt.mt_messageid
+       AND pt.mt_tagid = t.t_tagid
+        -- filter
+       AND m.m_creationdate > '2011-07-22T00:00:00'
+       AND t.t_name = 'Che_Guevara'
+     GROUP BY p.p_personid
+)
+   , person_score AS (
+    SELECT coalesce(pti.personid, pms.personid) AS personid
+         , CASE WHEN pti.personid IS NULL then 0 ELSE 100 END -- scored from interest in the given tag
+         + coalesce(pms.message_score, 0) AS score
+      FROM person_tag_interest pti
+           FULL JOIN person_message_score pms ON (pti.personid = pms.personid)
+)
+SELECT p.personid AS "person.id"
+     , p.score AS score
+     , sum(f.score) AS friendsScore
+  FROM person_score p
+     , knows k
+     , person_score f -- the friend
+ WHERE 1=1
+    -- join
+   AND p.personid = k.k_person1id
+   AND k.k_person2id = f.personid
+ GROUP BY p.personid, p.score
+ ORDER BY p.score + sum(f.score) DESC, p.personid
+ LIMIT 100
+;