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handler_read_last.result
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DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a INT, INDEX (a)); INSERT INTO t1 VALUES (),(),(),(),(),(),(),(),(),(); FLUSH STATUS; SELECT a FROM t1 ORDER BY a LIMIT 1; a NULL SHOW STATUS LIKE 'HANDLER_READ%'; Variable_name Value Handler_read_first 1 Handler_read_key 0 Handler_read_last 0 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 0 FLUSH STATUS; SELECT a FROM t1 ORDER BY a DESC LIMIT 1; a NULL SHOW STATUS LIKE 'HANDLER_READ%'; Variable_name Value Handler_read_first 0 Handler_read_key 0 Handler_read_last 1 Handler_read_next 0 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 0 FLUSH STATUS; SELECT a FROM t1 ORDER BY a LIMIT 3; a NULL NULL NULL SHOW STATUS LIKE 'HANDLER_READ%'; Variable_name Value Handler_read_first 1 Handler_read_key 0 Handler_read_last 0 Handler_read_next 2 Handler_read_prev 0 Handler_read_rnd 0 Handler_read_rnd_next 0 FLUSH STATUS; SELECT a FROM t1 ORDER BY a DESC LIMIT 3; a NULL NULL NULL SHOW STATUS LIKE 'HANDLER_READ%'; Variable_name Value Handler_read_first 0 Handler_read_key 0 Handler_read_last 1 Handler_read_next 0 Handler_read_prev 2 Handler_read_rnd 0 Handler_read_rnd_next 0 DROP TABLE t1;