EXPLAIN ANALYZE SELECT * FROM sample WHERE i=1 ORDER BY f DESC;
EXPLAIN ANALYZE SELECT * FROM sample WHERE i=1 ORDER BY f DESC LIMIT 10;
SET enable_indexscan = off;
EXPLAIN ANALYZE SELECT * FROM sample WHERE i=1 ORDER BY f DESC LIMIT 10;
SET enable_seqscan = off;
SET enable_indexscan = on;
EXPLAIN ANALYZE SELECT * FROM sample WHERE i=1 ORDER BY f DESC LIMIT 10;
