should be it

external/duckdb/benchmark/ldbc/queries/interactive-short-7.sql

@@ -0,0 +1,11 @@
+select p2.m_messageid, p2.m_content, p2.m_creationdate, p_personid, p_firstname, p_lastname,
+    (case when exists (
+     	   	       select 1 from knows
+		       where p1.m_creatorid = k_person1id and p2.m_creatorid = k_person2id)
+      then TRUE
+      else FALSE
+      end) as knows
+from message p1, message p2, person
+where
+  p1.m_messageid = 687194767741 and p2.m_c_replyof = p1.m_messageid and p2.m_creatorid = p_personid
+order by p2.m_creationdate desc, p2.m_creatorid asc;