SET geqo = off;
SET join_collapse_limit = 100;
CREATE TEMP TABLE t AS SELECT * FROM generate_series(1, 1000) f(n); ANALYZE t;

--- Vary join count
-- 242.4s
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10 NATURAL JOIN t t11
NATURAL JOIN t t12;
-- 31.2s
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10 NATURAL JOIN t t11;
-- 8.1s
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10;
-- 2.0s
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09;
-- 0.5s
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08;

--- Vary join_collapse_limit
-- 8.1s
SET join_collapse_limit = 100;
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10;
-- 8.0s
SET join_collapse_limit = 11;
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10;
-- 2.2s
SET join_collapse_limit = 10;
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10;
-- 0.5s
SET join_collapse_limit = 9;
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10;
-- 0.1s
SET join_collapse_limit = 8;
EXPLAIN SELECT 1 FROM t t00 NATURAL JOIN t t01 NATURAL JOIN t t02 NATURAL JOIN t
t03 NATURAL JOIN t t04 NATURAL JOIN t t05 NATURAL JOIN t t06 NATURAL JOIN t t07
NATURAL JOIN t t08 NATURAL JOIN t t09 NATURAL JOIN t t10;