mariadb/mysql-test/t/myisam_mrr.test

#
# MRR/MyISAM tests.
#

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

set @mrr_buffer_size_save= @@mrr_buffer_size;
set mrr_buffer_size=79;

-- source include/mrr_tests.inc

set @@mrr_buffer_size= @mrr_buffer_size_save;

#
# BUG#30622: Incorrect query results for MRR + filesort
# 
CREATE TABLE t1 (
  ID int(10) unsigned NOT NULL AUTO_INCREMENT,
  col1 int(10) unsigned DEFAULT NULL,
  key1 int(10) unsigned NOT NULL DEFAULT '0',
  key2 int(10) unsigned DEFAULT NULL,
  text1 text,
  text2 text,
  col2 smallint(6) DEFAULT '100',
  col3 enum('headers','bodyandsubject') NOT NULL DEFAULT 'bodyandsubject',
  col4 tinyint(3) unsigned NOT NULL DEFAULT '0',
  PRIMARY KEY (ID),
  KEY (key1),
  KEY (key2)
) ENGINE=MyISAM AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

INSERT INTO t1 VALUES
(1,NULL,1130,NULL,'Hello',NULL,100,'bodyandsubject',0),
(2,NULL,1130,NULL,'bye',NULL,100,'bodyandsubject',0),
(3,NULL,1130,NULL,'red',NULL,100,'bodyandsubject',0),
(4,NULL,1130,NULL,'yellow',NULL,100,'bodyandsubject',0),
(5,NULL,1130,NULL,'blue',NULL,100,'bodyandsubject',0);

select * FROM t1 WHERE key1=1130 AND col1 IS NULL ORDER BY text1;

drop table t1;


--echo 
--echo  BUG#37851: Crash in test_if_skip_sort_order tab->select is zero
--echo 
CREATE TABLE t1 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  PRIMARY KEY (pk)
);
INSERT INTO t1 VALUES (1);

CREATE TABLE t2 (
  pk int(11) NOT NULL AUTO_INCREMENT,
  int_key int(11) DEFAULT NULL,
  PRIMARY KEY (pk),
  KEY int_key (int_key)
);
INSERT INTO t2 VALUES (1,1),(2,6),(3,0);

EXPLAIN EXTENDED
SELECT MIN(t1.pk)
FROM t1 WHERE EXISTS (
 SELECT t2.pk
 FROM t2
 WHERE t2.int_key IS NULL
 GROUP BY t2.pk
);

DROP TABLE t1, t2;

-- echo #
-- echo # BUG#42048 Discrepancy between MyISAM and Maria's ICP implementation
-- 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, b char(20), filler char(200), key(a,b(10)));
insert into t1 select A.a + 10*(B.a + 10*C.a), 'bbb','filler' from t0 A, t0 B, t0 C;
update t1 set b=repeat(char(65+a), 20) where a < 25;

--echo This must show range + using index condition:
explain select * from t1 where a < 10 and b = repeat(char(65+a), 20);
select * from t1 where a < 10 and b = repeat(char(65+a), 20);
drop table t0,t1;

-- echo #
-- echo # BUG#41136: ORDER BY + range access: EXPLAIN shows "Using MRR" while MRR is actually not used
-- 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, b int, key(a));
insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0 A, t0 B, t0 C; 
-- echo This mustn't show "Using MRR":
explain select * from t1 where a < 20  order by a;
drop table t0, t1;

-- echo #
-- echo # Part of MWL#67: DS-MRR backport: add an @@optimizer_switch flag for
-- echo # index_condition pushdown: 
-- echo #   - engine_condition_pushdown does not affect ICP


# Check that optimizer_switch is present
select @@optimizer_switch like '%index_condition_pushdown=on%';

# Check if it affects ICP 
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int, b int, key(a));
insert into t1 select A.a + 10 *(B.a + 10*C.a), A.a + 10 *(B.a + 10*C.a) from t0 A, t0 B, t0 C; 

-- echo A query that will use ICP: 
explain select * from t1 where a < 20;

set @save_optimizer_switch=@@optimizer_switch;
set optimizer_switch='index_condition_pushdown=off';
explain select * from t1 where a < 20;

set optimizer_switch='index_condition_pushdown=on';
explain select * from t1 where a < 20;

set optimizer_switch=@save_optimizer_switch;


--echo # 
--echo # BUG#629684: Unreachable code in multi_range_read.cc in maria-5.3-dsmrr-cpk
--echo #

delete from t0 where a > 2;
insert into t0 values (NULL),(NULL);
insert into t1 values (NULL, 1234), (NULL, 5678);

set @save_join_cache_level=@@join_cache_level;
set @@join_cache_level=6;
explain 
select * from t0, t1 where t0.a<=>t1.a;
select * from t0, t1 where t0.a<=>t1.a;

set @@join_cache_level=@save_join_cache_level;
drop table t0, t1;