-- force nestloop indexscan plan
set enable_seqscan to 0;
set enable_mergejoin to 0;
set enable_hashjoin to 0;

explain
select count(*) from test_data a, test_data b, test_data c
where a.f1 = b.f1 and b.f1 = c.f1;

select count(*) from test_data a, test_data b, test_data c
where a.f1 = b.f1 and b.f1 = c.f1;