should be it

external/duckdb/benchmark/ldbc/queries/bi-9.sql

@@ -0,0 +1,48 @@
+/* Q9. Top thread initiators
+\set startDate '\'2012-06-01T00:00:00.000+00:00\''::timestamp
+\set endDate   '\'2012-07-01T00:00:00.000+00:00\''::timestamp
+ */
+WITH RECURSIVE post_all(psa_threadid
+                      , psa_thread_creatorid
+                      , psa_messageid
+                      , psa_creationdate
+                      , psa_messagetype
+                       ) AS (
+    SELECT m_messageid AS psa_threadid
+         , m_creatorid AS psa_thread_creatorid
+         , m_messageid AS psa_messageid
+         , m_creationdate
+         , 'Post'
+      FROM message
+     WHERE 1=1
+       AND m_c_replyof IS NULL -- post, not comment
+       AND m_creationdate BETWEEN '2012-06-01T00:00:00' AND '2012-07-01T00:00:00'
+  UNION ALL
+    SELECT psa.psa_threadid AS psa_threadid
+         , psa.psa_thread_creatorid AS psa_thread_creatorid
+         , m_messageid
+         , m_creationdate
+         , 'Comment'
+      FROM message p
+         , post_all psa
+     WHERE 1=1
+       AND p.m_c_replyof = psa.psa_messageid
+        -- this is a performance optimisation only
+       AND m_creationdate BETWEEN '2012-06-01T00:00:00' AND '2012-07-01T00:00:00'
+)
+SELECT p.p_personid AS "person.id"
+     , p.p_firstname AS "person.firstName"
+     , p.p_lastname AS "person.lastName"
+     , count(DISTINCT psa.psa_threadid) AS threadCount
+     -- if the thread initiator message does not count as a reply
+     --, count(DISTINCT CASE WHEN psa.psa_messagetype = 'Comment' then psa.psa_messageid ELSE null END) AS messageCount
+     , count(DISTINCT psa.psa_messageid) AS messageCount
+  FROM person p left join post_all psa on (
+       1=1
+   AND p.p_personid = psa.psa_thread_creatorid
+   AND psa_creationdate BETWEEN '2012-06-01T00:00:00' AND '2012-07-01T00:00:00'
+   )
+ GROUP BY p.p_personid, p.p_firstname, p.p_lastname
+ ORDER BY messageCount DESC, p.p_personid
+ LIMIT 100
+;