should be it

external/duckdb/benchmark/ldbc/queries/bi-10-shortestpath.sql

@@ -0,0 +1,77 @@
+/* Q10. Experts in social circle using shortest path semantics between startPerson and friends
+\set personId 19791209310731
+\set country '\'Pakistan\''
+\set tagClass '\'MusicalArtist\''
+\set minPathDistance 3
+\set maxPathDistance 5
+ */
+WITH RECURSIVE friends(startPerson, hopCount, friend) AS (
+    SELECT p_personid, 0, p_personid
+      FROM person
+     WHERE 1=1
+       AND p_personid = 19791209310731
+  UNION
+    SELECT f.startPerson
+         , f.hopCount+1
+         , CASE WHEN f.friend = k.k_person1id then k.k_person2id ELSE k.k_person1id END
+      FROM friends f
+         , knows k
+     WHERE 1=1
+        -- join
+       AND f.friend = k.k_person1id -- note, that knows table have both (p1, p2) and (p2, p1)
+        -- filter
+        -- stop condition
+       AND f.hopCount < 5
+)
+   , friends_shortest AS (
+     -- if a friend is reachable from startPerson using hopCount 2, 3 and 4, its distance from startPerson is 2
+    SELECT startPerson, min(hopCount) AS hopCount, friend
+      FROM friends
+     GROUP BY startPerson, friend
+)
+   , friend_list AS (
+    SELECT DISTINCT f.friend AS friendid
+      FROM friends_shortest f
+         , person tf -- the friend's preson record
+         , place ci -- city
+         , place co -- country
+     WHERE 1=1
+        -- join
+       AND f.friend = tf.p_personid
+       AND tf.p_placeid = ci.pl_placeid
+       AND ci.pl_containerplaceid = co.pl_placeid
+        -- filter
+       AND f.hopCount BETWEEN 3 AND 5
+       AND co.pl_name = 'Pakistan'
+)
+   , messages_of_tagclass_by_friends AS (
+    SELECT DISTINCT f.friendid
+         , m.m_messageid AS messageid
+      FROM friend_list f
+         , message m
+         , message_tag pt
+         , tag t
+         , tagclass tc
+     WHERE 1=1
+        -- join
+       AND f.friendid = m.m_creatorid
+       AND m.m_messageid = pt.mt_messageid
+       AND pt.mt_tagid = t.t_tagid
+       AND t.t_tagclassid = tc.tc_tagclassid
+        -- filter
+       AND tc.tc_name = 'MusicalArtist'
+)
+SELECT m.friendid AS "person.id"
+     , t.t_name AS "tag.name"
+     , count(*) AS messageCount
+  FROM messages_of_tagclass_by_friends m
+     , message_tag pt
+     , tag t
+ WHERE 1=1
+    -- join
+   AND m.messageid = pt.mt_messageid
+   AND pt.mt_tagid = t.t_tagid
+ GROUP BY m.friendid, t.t_name
+ ORDER BY messageCount DESC, t.t_name, m.friendid
+ LIMIT 100
+;