path: root/mysql-test/main/selectivity_no_engine.test

--source include/have_stat_tables.inc
--source include/default_optimizer_switch.inc

--echo #
--echo #  Engine-agnostic tests for statistics-based selectivity calculations.
--echo #   - selectivity tests that depend on the engine should go into
--echo #     t/selectivity.test. That test is run with myisam/innodb/xtradb.
--echo #   - this file is for tests that don't depend on the engine. 
--echo #

--disable_warnings
drop table if exists t0,t1,t2,t3;
--enable_warnings

select @@global.use_stat_tables;
select @@session.use_stat_tables;

set @save_use_stat_tables=@@use_stat_tables;

set use_stat_tables='preferably';

set @save_optimizer_use_condition_selectivity=@@optimizer_use_condition_selectivity;
set @save_histogram_size=@@histogram_size;
set @save_histogram_type=@@histogram_type;

--echo #
--echo # MDEV-5917: EITS: different order of predicates in IN (...) causes different estimates
--echo #
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t2 (col1 int);
--echo # one value in 1..100 range
insert into t2 select ta.a + tb.a*10 from t1 ta, t1 tb;
--echo # ten values in 100...200 range
insert into t2 select 100 + ta.a + tb.a*10 from t1 ta, t1 tb, t1 tc;

set histogram_type='SINGLE_PREC_HB';
set histogram_size=100;
set optimizer_use_condition_selectivity=4;
analyze table t2 persistent for all;

--echo # The following two must have the same in 'Extra' column:
explain extended select * from t2 where col1 IN (20, 180);
explain extended select * from t2 where col1 IN (180, 20);

drop table t1, t2;

--echo #
--echo # MDEV-5926: EITS: Histogram estimates for column=least_possible_value are wrong
--echo #
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(a int);
insert into t1 select ta.a from t0 ta, t0 tb, t0 tc;
set histogram_size=20;
set histogram_type='single_prec_hb';
analyze table t1 persistent for all;
set use_stat_tables='preferably';
set optimizer_use_condition_selectivity=4;
--echo # Should select about 10%:
explain extended select * from t1 where a=2;
--echo # Should select about 10%:
explain extended select * from t1 where a=1;
--echo # Must not have filtered=100%:
explain extended select * from t1 where a=0;
--echo # Again, must not have filtered=100%:
explain extended select * from t1 where a=-1;

drop table t0, t1;

--echo #
--echo # MDEV-4362: Selectivity estimates for IN (...) do not depend on whether the values are in range
--echo #
create table t1 (col1 int);
set @a=-1;
create table t2 (a int)  select (@a:=@a+1) as a from information_schema.session_variables ta limit 100;
insert into t1 select ta.a from t2 ta, t2 tb where ta.a < 100 and tb.a < 100;
select min(col1), max(col1), count(*) from t1;
set histogram_size=100;
analyze table t1 persistent for all;
explain extended select * from t1 where col1 in (1,2,3);
--echo # Must not cause fp division by zero, or produce nonsense numbers:
explain extended select * from t1 where col1 in (-1,-2,-3);
explain extended select * from t1 where col1<=-1;
drop table t1, t2;

--echo # 
--echo # MDEV-5984: EITS: Incorrect filtered% value for single-table select with range access
--echo # 
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);

create table t2 (a int, b int, col1 varchar(64), col2 varchar(64), key(a,b));
insert into t2 select ta.a+10*tb.a, tc.a+10*td.a, 'filler-data1', 'filler-data2' from t1 ta, t1 tb, t1 tc, t1 td;

set histogram_size=100;
set optimizer_use_condition_selectivity=4;
set use_stat_tables='preferably';
analyze table t2 persistent for all;
--echo # This must show filtered=100%:
explain extended select * from t2 where a in (1,2,3) and b in (1,2,3);

drop table t2, t1;

--echo # 
--echo # MDEV-5980: EITS: if condition is used for REF access, its selectivity is still in filtered%
--echo # 
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(key1 int, col1 int, key(key1));
insert into t1 select ta.a, ta.a from t0 ta, t0 tb, t0 tc;

set histogram_size=100;
set use_stat_tables='preferably';
set optimizer_use_condition_selectivity=4;
analyze table t1 persistent for all;
--echo # 10% is ok
explain extended select * from t1 where col1=2;
--echo # Must show 100%, not 10%
explain extended select * from t1 where key1=2;
drop table t0, t1;

--echo # MDEV-6003: EITS: ref access, keypart2=const vs keypart2=expr - inconsistent filtered% value
--echo # 
create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (
  kp1 int, kp2 int, 
  filler1 char(100),
  filler2 char(100),
  key(kp1, kp2)
);

insert into t1 
select 
  ta.a,
  tb.a,
  'filler-data-1',
  'filler-data-2'
from t0 ta, t0 tb, t0 tc;
set histogram_size=100;
set use_stat_tables='preferably';
set optimizer_use_condition_selectivity=4;
analyze table t1 persistent for all;
--echo # NOTE: 10*100%, 10*100% rows is ok
explain extended select * from t0, t1 where t1.kp1=t0.a and t1.kp2=t0.a+1;

--echo # NOTE: t0: 10*100% is ok,  t1: 10*9.90% is bad. t1 should have 10*100%.
explain extended select * from t0, t1 where t1.kp1=t0.a and t1.kp2=4;
drop table t0, t1;

--echo # 
--echo # MDEV-6209: Assertion `join->best_read < double(1.79769313486231570815e+308L)' 
--echo #            failed in bool greedy_search with optimizer_use_condition_selectivity>1
--echo # 
SET optimizer_use_condition_selectivity = 2;

CREATE TABLE t1 (a CHAR(6), b INT, PRIMARY KEY (a,b)) ENGINE=MyISAM;
INSERT INTO t1 VALUES ('foo',1),('bar',2);

SELECT * FROM t1 AS t1_1, t1 AS t1_2 WHERE NOT ( t1_1.a <> 'baz');
DROP TABLE t1;

--echo # 
--echo # MDEV-6308: Server crashes in table_multi_eq_cond_selectivity with ...
--echo #
CREATE TABLE t1 (
  id varchar(40) COLLATE utf8_bin,
  dt datetime,
  PRIMARY KEY (id)
);

INSERT INTO t1 VALUES ('foo','2011-04-12 05:18:08'),
                      ('bar','2013-09-19 11:37:03');

CREATE TABLE t2 (
  t1_id varchar(40) COLLATE utf8_bin,
  f1 varchar(64),
  f2 varchar(1024),
  KEY (f1,f2(255))
);

INSERT INTO t2 VALUES ('foo','baz','qux'),('bar','baz','qux');
INSERT INTO t2 VALUES ('foo','bazz','qux'),('bar','bazz','qux');

set optimizer_use_condition_selectivity=2;
explain
select * from t1,t2 where t1.id = t2.t1_id and t2.f2='qux' and t2.f1='baz';
select * from t1,t2 where t1.id = t2.t1_id and t2.f2='qux' and t2.f1='baz';

drop table t1,t2;

--echo # 
--echo # MDEV-5985: EITS: selectivity estimates look illogical for join and non-key equalities
--echo #

create table t0(a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1(a int);
insert into t1 select ta.a + tb.a* 10 + tc.a * 100 from t0 ta, t0 tb, t0 tc;
create table t2 as select * from t1;
set histogram_size=100;
set use_stat_tables='preferably';
set optimizer_use_condition_selectivity=4;
analyze table t1 persistent for all;
analyze table t2 persistent for all;
--echo # Filtered will be 4.95, 9.90
explain extended select * from t1 ta, t2 tb where ta.a < 40 and tb.a < 100;
--echo # Here, tb.filtered should not become 100%:
explain extended select * from t1 ta, t2 tb where ta.a < 40 and tb.a < 100 and tb.a=ta.a;

drop table t0,t1,t2;

--echo #
--echo # MDEV-8779: mysqld got signal 11 in sql/opt_range_mrr.cc:100(step_down_to)
--echo #
set @tmp_mdev8779=@@optimizer_use_condition_selectivity;
set optimizer_use_condition_selectivity=5;
CREATE TABLE t1 (
  i int(10) unsigned NOT NULL AUTO_INCREMENT,
  n varchar(2048) NOT NULL,
  d tinyint(1) unsigned NOT NULL,
  p int(10) unsigned NOT NULL,
  PRIMARY KEY (i)
) DEFAULT CHARSET=utf8;
insert into t1 values (1,'aaa',1,1), (2,'bbb',2,2);
SELECT * FROM t1 WHERE t1.d = 0 AND t1.p = '1' AND t1.i != '-1' AND t1.n = 'some text';
set optimizer_use_condition_selectivity= @tmp_mdev8779;
DROP TABLE t1;

--echo #
--echo # MDEV-23937: SIGSEGV in looped best_extension_by_limited_search from greedy_search
--echo # (Testcase only)
--echo #
set
  @tmp_jcl= @@join_cache_level,
  @tmp_ucs= @@optimizer_use_condition_selectivity;
set
  join_cache_level=3,
  optimizer_use_condition_selectivity=2;

CREATE TABLE t1 AS SELECT * FROM mysql.user;
CREATE TABLE t3 (b VARCHAR (1));
CREATE TABLE t2 (c2 INT);
INSERT INTO t2 VALUES (1);

EXPLAIN
SELECT * FROM t1 AS a NATURAL JOIN t1 AS b;

DROP TABLE t1,t2,t3;

--echo # 
--echo # End of the test file
--echo # 

set use_stat_tables= @save_use_stat_tables;
set histogram_type=@save_histogram_type;
set histogram_size=@save_histogram_size;
set optimizer_use_condition_selectivity=@save_optimizer_use_condition_selectivity;