should be it

external/duckdb/benchmark/ldbc/queries/bi-6.sql

@@ -0,0 +1,35 @@
+/* Q6. Most authoritative users on a given topic
+\set tag '\'Arnold_Schwarzenegger\''
+ */
+WITH poster_w_liker AS (
+  SELECT DISTINCT
+         m1.m_creatorid posterPersonid
+       , l2.l_personid as likerPersonid
+    FROM tag t
+       , message_tag pt
+       -- as an optimization, we use that the set of message1 is the same as message2
+       , message m1 LEFT JOIN likes l2 ON (m1.m_messageid = l2.l_messageid)
+       --, person p2 -- we don't need the person itself as its ID is in the like l2
+   WHERE 1=1
+      -- join
+     AND t.t_tagid = pt.mt_tagid
+     AND pt.mt_messageid = m1.m_messageid
+      -- filter
+     AND t.t_name = 'Arnold_Schwarzenegger'
+)
+, popularity_score AS (
+  SELECT m3.m_creatorid as personid, count(*) as popularityScore
+    FROM message m3
+       , likes l3
+   WHERE 1=1
+      -- join
+     AND m3.m_messageid = l3.l_messageid
+   GROUP BY personId
+)
+SELECT pl.posterPersonid as "person1.id"
+     , sum(coalesce(ps.popularityScore, 0)) as authorityScore
+  FROM poster_w_liker pl LEFT JOIN popularity_score ps ON (pl.likerPersonid = ps.personid)
+ GROUP BY pl.posterPersonid
+ ORDER BY authorityScore DESC, pl.posterPersonid ASC
+ LIMIT 100
+;