ClickHouse/dbms/tests/queries/0_stateless/00605_intersections_aggregate_functions.sql

DROP TABLE IF EXISTS test.test;
CREATE TABLE test.test(start Integer, end Integer) engine = Memory;
INSERT INTO test.test(start,end) VALUES (1,3),(2,7),(3,999),(4,7),(5,8);

/*
1 2 3 4 5 6 7 8 9
------------------>
1---3
  2---------7
    3-------------
      4-----7
        5-----8
------------------>
1 2 3 3 4 4 4 2 1  //intersections count for each point
*/

SELECT maxIntersections(start,end) FROM test.test;
SELECT maxIntersectionsPosition(start,end) FROM test.test;

DROP TABLE test.test;