path: root/mysql-test/t/null.test

# Initialise
--disable_warnings
drop table if exists t1, t2;
--enable_warnings

#
# Testing of NULL in a lot of different places
#

select null,\N,isnull(null),isnull(1/0),isnull(1/0 = null),ifnull(null,1),ifnull(null,"TRUE"),ifnull("TRUE","ERROR"),1/0 is null,1 is not null;
explain extended select null,\N,isnull(null),isnull(1/0),isnull(1/0 = null),ifnull(null,1),ifnull(null,"TRUE"),ifnull("TRUE","ERROR"),1/0 is null,1 is not null;
select 1 | NULL,1 & NULL,1+NULL,1-NULL;
select NULL=NULL,NULL<>NULL,IFNULL(NULL,1.1)+0,IFNULL(NULL,1) | 0;
select strcmp("a",NULL),(1<NULL)+0.0,NULL regexp "a",null like "a%","a%" like null;
select concat("a",NULL),replace(NULL,"a","b"),replace("string","i",NULL),replace("string",NULL,"i"),insert("abc",1,1,NULL),left(NULL,1);
select repeat("a",0),repeat("ab",5+5),repeat("ab",-1),reverse(NULL);
select field(NULL,"a","b","c");
select 2 between null and 1,2 between 3 AND NULL,NULL between 1 and 2,2 between NULL and 3, 2 between 1 AND null;
explain extended select 2 between null and 1,2 between 3 AND NULL,NULL between 1 and 2,2 between NULL and 3, 2 between 1 AND null;
SELECT NULL AND NULL, 1 AND NULL, NULL AND 1, NULL OR NULL, 0 OR NULL, NULL OR 0;
SELECT (NULL OR NULL) IS NULL;
select NULL AND 0, 0 and NULL;
select inet_ntoa(null),inet_aton(null),inet_aton("122.256"),inet_aton("122.226."),inet_aton("");
explain extended select inet_ntoa(null),inet_aton(null),inet_aton("122.256"),inet_aton("122.226."),inet_aton("");
select not null is true, not null or true, not null and false, not null <=> null;

create table t1 (x int);
insert into t1 values (null);
select * from t1 where x != 0;
drop table t1;

#
# Test problem med index on NULL columns and testing with =NULL;
#

CREATE TABLE t1 (
  indexed_field int default NULL,
  KEY indexed_field (indexed_field)
);
INSERT INTO t1 VALUES (NULL),(NULL);
SELECT * FROM t1 WHERE indexed_field=NULL;
SELECT * FROM t1 WHERE indexed_field IS NULL;
SELECT * FROM t1 WHERE indexed_field<=>NULL;
DROP TABLE t1;

#
# Testing of IFNULL
#
create table t1 (a int, b int) engine=myisam;
insert into t1 values(20,null);
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a;
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a order by 1;
insert into t1 values(10,null);
select t2.b, ifnull(t2.b,"this is null") from t1 as t2 left join t1 as t3 on
t2.b=t3.a order by 1;
drop table t1;

#
# Test inserting and updating with NULL
#
CREATE TABLE t1 (a varchar(16) NOT NULL default '', b smallint(6) NOT NULL default 0, c datetime NOT NULL default '0000-00-00 00:00:00', d smallint(6) NOT NULL default 0);
INSERT IGNORE INTO t1 SET a = "", d= "2003-01-14 03:54:55";
UPDATE IGNORE t1 SET d=1/NULL;
UPDATE IGNORE t1 SET d=NULL;
--error 1048
INSERT INTO t1 (a) values (null);
--error 1048
INSERT INTO t1 (a) values (1/null);
INSERT IGNORE INTO t1 (a) values (null),(null);
--error 1048
INSERT INTO t1 (b) values (null);
--error 1048
INSERT INTO t1 (b) values (1/null);
INSERT IGNORE INTO t1 (b) values (null),(null);
--error 1048
INSERT INTO t1 (c) values (null);
--error 1048
INSERT INTO t1 (c) values (1/null);
INSERT IGNORE INTO t1 (c) values (null),(null);
--error 1048
INSERT INTO t1 (d) values (null);
--error 1048
INSERT INTO t1 (d) values (1/null);
INSERT IGNORE INTO t1 (d) values (null),(null);
select * from t1;
drop table t1;

#
# Test to check elimination of IS NULL predicate for a non-nullable attribute
# (bug #1990)  
#
create table t1 (a int not null, b int not null, index idx(a));
insert into t1 values
  (1,1), (2,2), (3,3), (4,4), (5,5), (6,6),
  (7,7), (8,8), (9,9), (10,10), (11,11), (12,12);
explain select * from t1 where a between 2 and 3;
explain select * from t1 where a between 2 and 3 or b is null;
drop table t1;
select cast(NULL as signed);

#
# IS NULL is unable to use index in range if column is declared not null
# (Bug #4256)
#
create table t1(i int, key(i));
insert into t1 values(1);
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 select i*2 from t1;
insert into t1 values(null);
explain select * from t1 where i=2 or i is null;
select count(*) from t1 where i=2 or i is null;
SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
alter table t1 change i i int not null;
explain select * from t1 where i=2 or i is null;
select count(*) from t1 where i=2 or i is null;
drop table t1;

#
# NULL has its own type BINARY(0) by default.
# But NULL should be weaker than a constant
# when mixing charsets/collations
#
set names latin2;
# Check that result type is taken from a non-null string
create table t1 select
  null as c00,
  if(1, null, 'string') as c01,
  if(0, null, 'string') as c02,
  ifnull(null, 'string') as c03,
  ifnull('string', null) as c04,
  case when 0 then null else 'string' end as c05,
  case when 1 then null else 'string' end as c06,
  coalesce(null, 'string') as c07,
  coalesce('string', null) as c08,
  least('string',null) as c09,
  least(null, 'string') as c10,
  greatest('string',null) as c11,
  greatest(null, 'string') as c12,
  nullif('string', null) as c13,
  nullif(null, 'string') as c14,
  trim('string' from null) as c15,
  trim(null from 'string') as c16,
  substring_index('string', null, 1) as c17,
  substring_index(null, 'string', 1) as c18,
  elt(1, null, 'string') as c19,
  elt(1, 'string', null) as c20,
  concat('string', null) as c21,
  concat(null, 'string') as c22,
  concat_ws('sep', 'string', null) as c23,
  concat_ws('sep', null, 'string') as c24,
  concat_ws(null, 'string', 'string') as c25,
  make_set(3, 'string', null) as c26,
  make_set(3, null, 'string') as c27,
  export_set(3, null, 'off', 'sep') as c29,
  export_set(3, 'on', null, 'sep') as c30,
  export_set(3, 'on', 'off', null) as c31,
  replace(null, 'from', 'to') as c32,
  replace('str', null, 'to') as c33,
  replace('str', 'from', null) as c34,
  insert('str', 1, 2, null) as c35,
  insert(null, 1, 2, 'str') as c36,
  lpad('str', 10, null) as c37,
  rpad(null, 10, 'str') as c38;
  
show create table t1;
drop table t1;

#
# Check that comparison is done according to
# non-null string collation, i.e. case insensitively,
# rather than according to NULL's collation, i.e. case sensitively
#
# in field
select 
  case 'str' when 'STR' then 'str' when null then 'null' end as c01,
  case 'str' when null then 'null' when 'STR' then 'str' end as c02,
  field(null, 'str1', 'str2') as c03,
  field('str1','STR1', null) as c04,
  field('str1', null, 'STR1') as c05,
  'string' in ('STRING', null) as c08,
  'string' in (null, 'STRING') as c09;

# Restore charset to the default value.
set names latin1;

#
# Bug#19145: mysqld crashes if you set the default value of an enum field to NULL
#
create table bug19145a (e enum('a','b','c')          default 'b' , s set('x', 'y', 'z')          default 'y' ) engine=MyISAM;
create table bug19145b (e enum('a','b','c')          default null, s set('x', 'y', 'z')          default null) engine=MyISAM;

create table bug19145c (e enum('a','b','c') not null default 'b' , s set('x', 'y', 'z') not null default 'y' ) engine=MyISAM;

# Invalid default value for 's'
--error 1067
create table bug19145setnotnulldefaultnull (e enum('a','b','c')          default null, s set('x', 'y', 'z') not null default null) engine=MyISAM;

# Invalid default value for 'e'
--error 1067
create table bug19145enumnotnulldefaultnull (e enum('a','b','c') not null default null, s set('x', 'y', 'z')          default null) engine=MyISAM;

alter table bug19145a alter column e set default null;
alter table bug19145a alter column s set default null;
alter table bug19145a add column (i int);

alter table bug19145b alter column e set default null;
alter table bug19145b alter column s set default null;
alter table bug19145b add column (i int);

# Invalid default value for 'e'
--error 1067
alter table bug19145c alter column e set default null;

# Invalid default value for 's'
--error 1067
alter table bug19145c alter column s set default null;
alter table bug19145c add column (i int);

show create table bug19145a;
show create table bug19145b;
show create table bug19145c;

drop table bug19145a;
drop table bug19145b;
drop table bug19145c;

--echo # End of 4.1 tests

--echo #
--echo # Bug #31471: decimal_bin_size: Assertion `scale >= 0 &&
--echo #             precision > 0 && scale <= precision'
--echo #

CREATE TABLE t1 (a DECIMAL (1, 0) ZEROFILL, b DECIMAL (1, 0) ZEROFILL);
INSERT INTO t1 (a, b) VALUES (0, 0);

CREATE TABLE t2 SELECT IFNULL(a, b) FROM t1;
DESCRIBE t2;
DROP TABLE t2;

CREATE TABLE t2 SELECT IFNULL(a, NULL) FROM t1;
DESCRIBE t2;
DROP TABLE t2;

CREATE TABLE t2 SELECT IFNULL(NULL, b) FROM t1;
DESCRIBE t2;

DROP TABLE t1, t2;

--echo # End of 5.0 tests

--echo #
--echo # MDEV-4895 Valgrind warnings (Conditional jump or move depends on uninitialised value) in Field_datetime::get_date on GREATEST(..) IS NULL
--echo #

CREATE TABLE t1 (dt DATETIME NOT NULL);
INSERT INTO t1 VALUES (NOW()),(NOW());

EXPLAIN
SELECT * FROM t1 WHERE concat( dt, '2012-12-21 12:12:12' ) IS NULL;
SELECT * FROM t1 WHERE concat( dt, '2012-12-21 12:12:12' ) IS NULL;

DROP TABLE t1;
CREATE TABLE t1 (dt INT NOT NULL);
INSERT INTO t1 VALUES (1),(2);
EXPLAIN
SELECT * FROM t1 WHERE concat( dt, '1' ) IS NULL;
SELECT * FROM t1 WHERE concat( dt, '1' ) IS NULL;

DROP TABLE t1;
CREATE TABLE t1 (dt INT NOT NULL);
INSERT INTO t1 VALUES (1),(2);

EXPLAIN
SELECT * FROM t1 WHERE NOT (concat( dt, '1' ) IS NOT NULL); 
SELECT * FROM t1 WHERE NOT (concat( dt, '1' ) IS NOT NULL); 

DROP TABLE t1;

--echo #
--echo # Bug mdev-5132: crash when exeicuting a join query
--echo #                with IS NULL and IS NOT NULL in where
--echo #

CREATE TABLE t1 (a DATE, b INT, c INT, KEY(a), KEY(b), KEY(c)) ENGINE=MyISAM; 
CREATE TABLE t2 (d DATE) ENGINE=MyISAM; 

SELECT  * FROM t1,t2 WHERE  1 IS NOT NULL AND t1.b IS NULL;

DROP TABLE t1,t2;

--echo #
--echo # Start of 10.0 tests
--echo #

--echo #
--echo # MDEV-7001 Bad result for NOT NOT STRCMP('a','b') and NOT NOT NULLIF(2,3) 
--echo #
SELECT NOT NOT NULLIF(2,3);

--echo #
--echo # End of 10.0 tests
--echo #

--echo #
--echo # Start of 10.1 tests
--echo #

--echo #
--echo # MDEV-7146 NULLIF returns unexpected result with a YEAR field
--echo #
CREATE TABLE t1 (a YEAR(2));
INSERT INTO t1 VALUES (0);
SELECT a,NULLIF(a,2000),NULLIF(2000,a) FROM t1;
SELECT a,NULLIF(a,2001),NULLIF(2001,a) FROM t1;
DROP TABLE t1;

--echo #
--echo # MDEV-7005 NULLIF does not work as documented
--echo #

CREATE TABLE t1 (a TIME);
CREATE TABLE t2 AS SELECT a,NULLIF(a,a), CASE WHEN a=a THEN NULL ELSE a END FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t1,t2;

--error ER_CANT_AGGREGATE_2COLLATIONS
SELECT NULLIF(_latin1'a' COLLATE latin1_general_ci, _latin1'a' COLLATE latin1_bin);

SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
CREATE TABLE t1 AS SELECT
  NULLIF(1,1),
  NULLIF(1,1.0),
  NULLIF(1,1e0),
  NULLIF(1,'2001-01-01'),
  NULLIF(1,TIME'00:00:00');
SHOW CREATE TABLE t1;
DROP TABLE t1;

SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
CREATE TABLE t1 AS SELECT
  NULLIF(1.0,1),
  NULLIF(1.0,1.0),
  NULLIF(1.0,1e0),
  NULLIF(1.0,'2001-01-01'),
  NULLIF(1.0,TIME'00:00:00');
SHOW CREATE TABLE t1;
DROP TABLE t1;

SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
CREATE TABLE t1 AS SELECT
  NULLIF(1e0,1),
  NULLIF(1e0,1.0),
  NULLIF(1e0,1e0),
  NULLIF(1e0,'2001-01-01'),
  NULLIF(1e0,TIME'00:00:00');
SHOW CREATE TABLE t1;
DROP TABLE t1;

CREATE TABLE t1 AS SELECT
  NULLIF('1',1),
  NULLIF('1',1.0),
  NULLIF('1',1e0),
  NULLIF('1','2001-01-01'),
  NULLIF('1',TIME'00:00:00');
SHOW CREATE TABLE t1;
DROP TABLE t1;

SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
CREATE TABLE t1 AS SELECT
  NULLIF(TIMESTAMP'2001-01-01 00:00:00',1),
  NULLIF(TIMESTAMP'2001-01-01 00:00:00',1.0),
  NULLIF(TIMESTAMP'2001-01-01 00:00:00',1e0),
  NULLIF(TIMESTAMP'2001-01-01 00:00:00','2001-01-01'),
  NULLIF(TIMESTAMP'2001-01-01 00:00:00',TIME'00:00:00');
SHOW CREATE TABLE t1;
DROP TABLE t1;

SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
CREATE TABLE t1 AS SELECT
  NULLIF(DATE'2001-01-01',1),
  NULLIF(DATE'2001-01-01',1.0),
  NULLIF(DATE'2001-01-01',1e0),
  NULLIF(DATE'2001-01-01','2001-01-01'),
  NULLIF(DATE'2001-01-01',TIME'00:00:00');
SHOW CREATE TABLE t1;
DROP TABLE t1;

CREATE TABLE t1 AS SELECT
  NULLIF(TIME'00:00:01',1),
  NULLIF(TIME'00:00:01',1.0),
  NULLIF(TIME'00:00:01',1e0),
  NULLIF(TIME'00:00:01','00:00:00'),
  NULLIF(TIME'00:00:01',DATE'2001-01-01');
SHOW CREATE TABLE t1;
DROP TABLE t1;

CREATE TABLE t1
(
  c_tinyint    TINYINT,
  c_smallint   SMALLINT,
  c_int        INT,
  c_bigint     BIGINT,
  c_float      FLOAT,
  c_double     DOUBLE,
  c_decimal103 DECIMAL(10,3),
  c_varchar10  VARCHAR(10),
  c_text       TEXT,
  c_blob       BLOB,
  c_enum       ENUM('one','two','tree'),
  c_datetime3  DATETIME(3),
  c_timestamp3 TIMESTAMP(3),
  c_date       DATE,
  c_time       TIME
);

--echo #
--echo # Checking that the return type depends only on args[0], even when compared to a super type
--echo #

CREATE TABLE t2 AS SELECT
  NULLIF(c_tinyint,  1),
  NULLIF(c_tinyint,  c_smallint),
  NULLIF(c_tinyint,  c_tinyint),
  NULLIF(c_tinyint,  c_int),
  NULLIF(c_tinyint,  c_bigint),
  NULLIF(c_tinyint,  c_float),
  NULLIF(c_tinyint,  c_double),
  NULLIF(c_tinyint,  c_decimal103),
  NULLIF(c_tinyint,  c_varchar10),
  NULLIF(c_tinyint,  c_text),
  NULLIF(c_tinyint,  c_blob),
  NULLIF(c_tinyint,  c_enum),
  NULLIF(c_tinyint,  c_datetime3),
  NULLIF(c_tinyint,  c_timestamp3),
  NULLIF(c_tinyint,  c_date),
  NULLIF(c_tinyint,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_smallint,  1),
  NULLIF(c_smallint,  c_smallint),
  NULLIF(c_smallint,  c_tinyint),
  NULLIF(c_smallint,  c_int),
  NULLIF(c_smallint,  c_bigint),
  NULLIF(c_smallint,  c_float),
  NULLIF(c_smallint,  c_double),
  NULLIF(c_smallint,  c_decimal103),
  NULLIF(c_smallint,  c_varchar10),
  NULLIF(c_smallint,  c_text),
  NULLIF(c_smallint,  c_blob),
  NULLIF(c_smallint,  c_enum),
  NULLIF(c_smallint,  c_datetime3),
  NULLIF(c_smallint,  c_timestamp3),
  NULLIF(c_smallint,  c_date),
  NULLIF(c_smallint,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_int,  1),
  NULLIF(c_int,  c_smallint),
  NULLIF(c_int,  c_tinyint),
  NULLIF(c_int,  c_int),
  NULLIF(c_int,  c_bigint),
  NULLIF(c_int,  c_float),
  NULLIF(c_int,  c_double),
  NULLIF(c_int,  c_decimal103),
  NULLIF(c_int,  c_varchar10),
  NULLIF(c_int,  c_text),
  NULLIF(c_int,  c_blob),
  NULLIF(c_int,  c_enum),
  NULLIF(c_int,  c_datetime3),
  NULLIF(c_int,  c_timestamp3),
  NULLIF(c_int,  c_date),
  NULLIF(c_int,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_bigint,  1),
  NULLIF(c_bigint,  c_smallint),
  NULLIF(c_bigint,  c_tinyint),
  NULLIF(c_bigint,  c_int),
  NULLIF(c_bigint,  c_bigint),
  NULLIF(c_bigint,  c_float),
  NULLIF(c_bigint,  c_double),
  NULLIF(c_bigint,  c_decimal103),
  NULLIF(c_bigint,  c_varchar10),
  NULLIF(c_bigint,  c_text),
  NULLIF(c_bigint,  c_blob),
  NULLIF(c_bigint,  c_enum),
  NULLIF(c_bigint,  c_datetime3),
  NULLIF(c_bigint,  c_timestamp3),
  NULLIF(c_bigint,  c_date),
  NULLIF(c_bigint,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

# QQ: this should probably create a FLOAT column instead of a DOUBLE column
CREATE TABLE t2 AS SELECT
  NULLIF(c_float,  1),
  NULLIF(c_float,  c_smallint),
  NULLIF(c_float,  c_tinyint),
  NULLIF(c_float,  c_int),
  NULLIF(c_float,  c_bigint),
  NULLIF(c_float,  c_float),
  NULLIF(c_float,  c_double),
  NULLIF(c_float,  c_decimal103),
  NULLIF(c_float,  c_varchar10),
  NULLIF(c_float,  c_text),
  NULLIF(c_float,  c_blob),
  NULLIF(c_float,  c_enum),
  NULLIF(c_float,  c_datetime3),
  NULLIF(c_float,  c_timestamp3),
  NULLIF(c_float,  c_date),
  NULLIF(c_float,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_double,  1),
  NULLIF(c_double,  c_smallint),
  NULLIF(c_double,  c_tinyint),
  NULLIF(c_double,  c_int),
  NULLIF(c_double,  c_bigint),
  NULLIF(c_double,  c_float),
  NULLIF(c_double,  c_double),
  NULLIF(c_double,  c_decimal103),
  NULLIF(c_double,  c_varchar10),
  NULLIF(c_double,  c_text),
  NULLIF(c_double,  c_blob),
  NULLIF(c_double,  c_enum),
  NULLIF(c_double,  c_datetime3),
  NULLIF(c_double,  c_timestamp3),
  NULLIF(c_double,  c_date),
  NULLIF(c_double,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_decimal103,  1),
  NULLIF(c_decimal103,  c_smallint),
  NULLIF(c_decimal103,  c_tinyint),
  NULLIF(c_decimal103,  c_int),
  NULLIF(c_decimal103,  c_bigint),
  NULLIF(c_decimal103,  c_float),
  NULLIF(c_decimal103,  c_double),
  NULLIF(c_decimal103,  c_decimal103),
  NULLIF(c_decimal103,  c_varchar10),
  NULLIF(c_decimal103,  c_text),
  NULLIF(c_decimal103,  c_blob),
  NULLIF(c_decimal103,  c_enum),
  NULLIF(c_decimal103,  c_datetime3),
  NULLIF(c_decimal103,  c_timestamp3),
  NULLIF(c_decimal103,  c_date),
  NULLIF(c_decimal103,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_varchar10,  1),
  NULLIF(c_varchar10,  c_smallint),
  NULLIF(c_varchar10,  c_tinyint),
  NULLIF(c_varchar10,  c_int),
  NULLIF(c_varchar10,  c_bigint),
  NULLIF(c_varchar10,  c_float),
  NULLIF(c_varchar10,  c_double),
  NULLIF(c_varchar10,  c_decimal103),
  NULLIF(c_varchar10,  c_varchar10),
  NULLIF(c_varchar10,  c_text),
  NULLIF(c_varchar10,  c_blob),
  NULLIF(c_varchar10,  c_enum),
  NULLIF(c_varchar10,  c_datetime3),
  NULLIF(c_varchar10,  c_timestamp3),
  NULLIF(c_varchar10,  c_date),
  NULLIF(c_varchar10,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_text,  1),
  NULLIF(c_text,  c_smallint),
  NULLIF(c_text,  c_tinyint),
  NULLIF(c_text,  c_int),
  NULLIF(c_text,  c_bigint),
  NULLIF(c_text,  c_float),
  NULLIF(c_text,  c_double),
  NULLIF(c_text,  c_decimal103),
  NULLIF(c_text,  c_varchar10),
  NULLIF(c_text,  c_text),
  NULLIF(c_text,  c_blob),
  NULLIF(c_text,  c_enum),
  NULLIF(c_text,  c_datetime3),
  NULLIF(c_text,  c_timestamp3),
  NULLIF(c_text,  c_date),
  NULLIF(c_text,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

# QQ: this should probably create BLOB instead of LONGBLOB
CREATE TABLE t2 AS SELECT
  NULLIF(c_blob,  1),
  NULLIF(c_blob,  c_smallint),
  NULLIF(c_blob,  c_tinyint),
  NULLIF(c_blob,  c_int),
  NULLIF(c_blob,  c_bigint),
  NULLIF(c_blob,  c_float),
  NULLIF(c_blob,  c_double),
  NULLIF(c_blob,  c_decimal103),
  NULLIF(c_blob,  c_varchar10),
  NULLIF(c_blob,  c_text),
  NULLIF(c_blob,  c_blob),
  NULLIF(c_blob,  c_enum),
  NULLIF(c_blob,  c_datetime3),
  NULLIF(c_blob,  c_timestamp3),
  NULLIF(c_blob,  c_date),
  NULLIF(c_blob,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

# QQ: this should probably create a ENUM column instead of VARCHAR(4)
CREATE TABLE t2 AS SELECT
  NULLIF(c_enum,  1),
  NULLIF(c_enum,  c_smallint),
  NULLIF(c_enum,  c_tinyint),
  NULLIF(c_enum,  c_int),
  NULLIF(c_enum,  c_bigint),
  NULLIF(c_enum,  c_float),
  NULLIF(c_enum,  c_double),
  NULLIF(c_enum,  c_decimal103),
  NULLIF(c_enum,  c_varchar10),
  NULLIF(c_enum,  c_text),
  NULLIF(c_enum,  c_blob),
  NULLIF(c_enum,  c_enum),
  NULLIF(c_enum,  c_datetime3),
  NULLIF(c_enum,  c_timestamp3),
  NULLIF(c_enum,  c_date),
  NULLIF(c_enum,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_datetime3,  1),
  NULLIF(c_datetime3,  c_smallint),
  NULLIF(c_datetime3,  c_tinyint),
  NULLIF(c_datetime3,  c_int),
  NULLIF(c_datetime3,  c_bigint),
  NULLIF(c_datetime3,  c_float),
  NULLIF(c_datetime3,  c_double),
  NULLIF(c_datetime3,  c_decimal103),
  NULLIF(c_datetime3,  c_varchar10),
  NULLIF(c_datetime3,  c_text),
  NULLIF(c_datetime3,  c_blob),
  NULLIF(c_datetime3,  c_enum),
  NULLIF(c_datetime3,  c_datetime3),
  NULLIF(c_datetime3,  c_timestamp3),
  NULLIF(c_datetime3,  c_date),
  NULLIF(c_datetime3,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_timestamp3,  1),
  NULLIF(c_timestamp3,  c_smallint),
  NULLIF(c_timestamp3,  c_tinyint),
  NULLIF(c_timestamp3,  c_int),
  NULLIF(c_timestamp3,  c_bigint),
  NULLIF(c_timestamp3,  c_float),
  NULLIF(c_timestamp3,  c_double),
  NULLIF(c_timestamp3,  c_decimal103),
  NULLIF(c_timestamp3,  c_varchar10),
  NULLIF(c_timestamp3,  c_text),
  NULLIF(c_timestamp3,  c_blob),
  NULLIF(c_timestamp3,  c_enum),
  NULLIF(c_timestamp3,  c_datetime3),
  NULLIF(c_timestamp3,  c_timestamp3),
  NULLIF(c_timestamp3,  c_date),
  NULLIF(c_timestamp3,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_date,  1),
  NULLIF(c_date,  c_smallint),
  NULLIF(c_date,  c_tinyint),
  NULLIF(c_date,  c_int),
  NULLIF(c_date,  c_bigint),
  NULLIF(c_date,  c_float),
  NULLIF(c_date,  c_double),
  NULLIF(c_date,  c_decimal103),
  NULLIF(c_date,  c_varchar10),
  NULLIF(c_date,  c_text),
  NULLIF(c_date,  c_blob),
  NULLIF(c_date,  c_enum),
  NULLIF(c_date,  c_datetime3),
  NULLIF(c_date,  c_timestamp3),
  NULLIF(c_date,  c_date),
  NULLIF(c_date,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(c_time,  1),
  NULLIF(c_time,  c_smallint),
  NULLIF(c_time,  c_tinyint),
  NULLIF(c_time,  c_int),
  NULLIF(c_time,  c_bigint),
  NULLIF(c_time,  c_float),
  NULLIF(c_time,  c_double),
  NULLIF(c_time,  c_decimal103),
  NULLIF(c_time,  c_varchar10),
  NULLIF(c_time,  c_text),
  NULLIF(c_time,  c_blob),
  NULLIF(c_time,  c_enum),
  NULLIF(c_time,  c_datetime3),
  NULLIF(c_time,  c_timestamp3),
  NULLIF(c_time,  c_date),
  NULLIF(c_time,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

--echo #
--echo # Checking that the return type depends only on args[0], even if compared to a field
--echo #

CREATE TABLE t2 AS SELECT
  NULLIF(1,  1),
  NULLIF(1,  c_smallint),
  NULLIF(1,  c_tinyint),
  NULLIF(1,  c_int),
  NULLIF(1,  c_bigint),
  NULLIF(1,  c_float),
  NULLIF(1,  c_double),
  NULLIF(1,  c_decimal103),
  NULLIF(1,  c_varchar10),
  NULLIF(1,  c_text),
  NULLIF(1,  c_blob),
  NULLIF(1,  c_enum),
  NULLIF(1,  c_datetime3),
  NULLIF(1,  c_timestamp3),
  NULLIF(1,  c_date),
  NULLIF(1,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(1.0,  1),
  NULLIF(1.0,  c_smallint),
  NULLIF(1.0,  c_tinyint),
  NULLIF(1.0,  c_int),
  NULLIF(1.0,  c_bigint),
  NULLIF(1.0,  c_float),
  NULLIF(1.0,  c_double),
  NULLIF(1.0,  c_decimal103),
  NULLIF(1.0,  c_varchar10),
  NULLIF(1.0,  c_text),
  NULLIF(1.0,  c_blob),
  NULLIF(1.0,  c_enum),
  NULLIF(1.0,  c_datetime3),
  NULLIF(1.0,  c_timestamp3),
  NULLIF(1.0,  c_date),
  NULLIF(1.0,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(1e0,  1),
  NULLIF(1e0,  c_smallint),
  NULLIF(1e0,  c_tinyint),
  NULLIF(1e0,  c_int),
  NULLIF(1e0,  c_bigint),
  NULLIF(1e0,  c_float),
  NULLIF(1e0,  c_double),
  NULLIF(1e0,  c_decimal103),
  NULLIF(1e0,  c_varchar10),
  NULLIF(1e0,  c_text),
  NULLIF(1e0,  c_blob),
  NULLIF(1e0,  c_enum),
  NULLIF(1e0,  c_datetime3),
  NULLIF(1e0,  c_timestamp3),
  NULLIF(1e0,  c_date),
  NULLIF(1e0,  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF('1',  1),
  NULLIF('1',  c_smallint),
  NULLIF('1',  c_tinyint),
  NULLIF('1',  c_int),
  NULLIF('1',  c_bigint),
  NULLIF('1',  c_float),
  NULLIF('1',  c_double),
  NULLIF('1',  c_decimal103),
  NULLIF('1',  c_varchar10),
  NULLIF('1',  c_text),
  NULLIF('1',  c_blob),
  NULLIF('1',  c_enum),
  NULLIF('1',  c_datetime3),
  NULLIF('1',  c_timestamp3),
  NULLIF('1',  c_date),
  NULLIF('1',  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

CREATE TABLE t2 AS SELECT
  NULLIF(TIME'10:10:10',  1),
  NULLIF(TIME'10:10:10',  c_smallint),
  NULLIF(TIME'10:10:10',  c_tinyint),
  NULLIF(TIME'10:10:10',  c_int),
  NULLIF(TIME'10:10:10',  c_bigint),
  NULLIF(TIME'10:10:10',  c_float),
  NULLIF(TIME'10:10:10',  c_double),
  NULLIF(TIME'10:10:10',  c_decimal103),
  NULLIF(TIME'10:10:10',  c_varchar10),
  NULLIF(TIME'10:10:10',  c_text),
  NULLIF(TIME'10:10:10',  c_blob),
  NULLIF(TIME'10:10:10',  c_enum),
  NULLIF(TIME'10:10:10',  c_datetime3),
  NULLIF(TIME'10:10:10',  c_timestamp3),
  NULLIF(TIME'10:10:10',  c_date),
  NULLIF(TIME'10:10:10',  c_time)
FROM t1;
SHOW CREATE TABLE t2;
DROP TABLE t2;

DROP TABLE t1;

--echo #
--echo # MDEV-7759 NULLIF(x,y) is not equal to CASE WHEN x=y THEN NULL ELSE x END
--echo #
CREATE TABLE t1 (a YEAR);
INSERT INTO t1 VALUES (2010),(2020);
SELECT * FROM t1 WHERE a=2010 AND NULLIF(10.1,a) IS NULL;
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a=2010 AND NULLIF(10.1,a) IS NULL;
SELECT * FROM t1 WHERE a=2010 AND CASE WHEN 10.1=a THEN NULL ELSE 10.1 END IS NULL;
EXPLAIN EXTENDED SELECT * FROM t1 WHERE a=2010 AND CASE WHEN 10.1=a THEN NULL ELSE 10.1 END IS NULL;
DROP TABLE t1;

--echo # Two warnings expected
SET STATEMENT sql_mode = 'NO_ENGINE_SUBSTITUTION' FOR
CREATE TABLE t1 AS SELECT
  NULLIF(TIMESTAMP'2001-01-01 00:00:00',1) AS a,
  CASE WHEN TIMESTAMP'2001-01-01 00:00:00'=1 THEN NULL
       ELSE TIMESTAMP'2001-01-01 00:00:00'
  END AS b;
DROP TABLE t1;

--echo #
--echo # MDEV-8785 Wrong results for EXPLAIN EXTENDED...WHERE NULLIF(latin1_col, _utf8'a' COLLATE utf8_bin) IS NOT NULL
--echo #
CREATE TABLE t1 (a VARCHAR(10) CHARACTER SET latin1);
INSERT INTO t1 VALUES ('a'),('A');
SELECT a, NULLIF(a,_utf8'a' COLLATE utf8_bin) IS NULL FROM t1;
SELECT CHARSET(NULLIF(a,_utf8'a' COLLATE utf8_bin)) FROM t1;
EXPLAIN EXTENDED SELECT NULLIF(a,_utf8'a' COLLATE utf8_bin) IS NULL AS expr FROM t1;
DROP TABLE t1;


--echo #
--echo # MDEV-8740 Wrong result for SELECT..WHERE year_field=10 AND NULLIF(year_field,2011.1)='2011'
--echo #
CREATE TABLE t1 (a YEAR);
INSERT INTO t1 VALUES (2010),(2011);
SELECT a=10 AND NULLIF(a,2011.1)='2011' AS cond FROM t1;
SELECT * FROM t1 WHERE a=10;
SELECT * FROM t1 WHERE NULLIF(a,2011.1)='2011';
SELECT * FROM t1 WHERE a=10 AND NULLIF(a,2011.1)='2011';
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE a=10 AND NULLIF(a,2011.1)='2011';
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE a=10 AND NULLIF(a,2011.1)=CONCAT('2011',RAND());
DROP TABLE t1;


--echo #
--echo # MDEV-8754 Wrong result for SELECT..WHERE year_field=2020 AND NULLIF(year_field,2010)='2020'
--echo #
CREATE TABLE t1 (a YEAR);
INSERT INTO t1 VALUES (2010),(2020);
SELECT * FROM t1 WHERE a=2020;
SELECT * FROM t1 WHERE NULLIF(a,2010)='2020';
SELECT * FROM t1 WHERE a=2020 AND NULLIF(a,2010)='2020';
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE a=2020 AND NULLIF(a,2010)='2020';
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE a=2020 AND NULLIF(a,2010)=CONCAT('2020',RAND());
DROP TABLE t1;

--echo #
--echo # MDEV-9181 (NULLIF(count(table.col)), 0) gives wrong result on 10.1.x
--echo #
CREATE TABLE t1 (c1 varchar(50) DEFAULT NULL);
INSERT INTO t1 (c1) VALUES ('hello'), ('hello\r\n'), ('hello'),('hello');
SELECT NULLIF(COUNT(c1),0) FROM t1;
SELECT CASE WHEN COUNT(c1)=0 THEN NULL ELSE COUNT(c1) END  FROM t1;
SELECT NULLIF(COUNT(c1)+0,0) AS c1,NULLIF(CAST(COUNT(c1) AS SIGNED),0) AS c2,NULLIF(CONCAT(COUNT(c1)),0) AS c3 FROM t1;
SELECT NULLIF(COUNT(DISTINCT c1),0) FROM t1;
SELECT CASE WHEN COUNT(DISTINCT c1)=0 THEN NULL ELSE COUNT(DISTINCT c1) END  FROM t1;
DROP TABLE t1;

CREATE TABLE  t1 (
  id INT NOT NULL,
  c1 INT DEFAULT NULL
);
INSERT INTO t1 VALUES (1,1),(1,2),(2,3),(2,4);
SELECT NULLIF(COUNT(c1),0) AS c1,NULLIF(COUNT(c1)+0,0) AS c1_wrapped,CASE WHEN COUNT(c1) IS NULL THEN 0 ELSE COUNT(c1) END AS c1_case FROM t1 GROUP BY id;
DROP TABLE t1;

# Testing with side effects

CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES (1),(2),(3);
SET @a=0;
SELECT NULLIF(LAST_VALUE(@a:=@a+1,a),0) FROM t1;
SELECT @a;
SET @a=0;
SELECT NULLIF(AVG(a),0), NULLIF(AVG(LAST_VALUE(@a:=@a+1,a)),0) FROM t1;
SELECT @a;

# There should not be cache in here:

EXPLAIN EXTENDED SELECT NULLIF(a,0) FROM t1;

# But there should be a cache in here:
EXPLAIN EXTENDED SELECT NULLIF(AVG(a),0) FROM t1;

DROP TABLE t1;

#
# MDEV-9576 syntax error on view with nullif and count
#
create table t1 (col1 varchar(50));
create view v1 AS select nullif(count(distinct col1),0) from t1;
show create view v1;
drop view v1;
drop table t1;

#
# MDEV-9637 select nullif(count(col1),0) gives wrong result if in a view
#
create table t1 (col1 varchar(50) default null);
insert into t1 (col1) values ('hello'), ('hello'), ('hello');
create view v1 as select nullif(count(col1),0) from t1;
select * from v1;
select nullif(count(col1),0) from t1;
drop view v1;
drop table t1;

#
# MDEV-9644 Assertion `args[0] == args[2] || thd->stmt_arena->is_stmt_execute()' failed in Item_func_nullif::fix_length_and_dec()
#
select nullif((select 1), (select 2));
create table t1 (f int);
insert into t1 values (1),(2);
select nullif( not f, 1 ) from t1;
drop table t1;

#
# MDEV-9641 Assertion `args[0] == args[2] || _current_thd()->lex->context_analysis_only' failed in Item_func_nullif::print(String*, enum_query_type)
#
set names utf8;
create table t1 (f1 varchar(10));
insert into t1 values ('2015-12-31');
--error ER_DATA_OUT_OF_RANGE
select power( timestamp( nullif( '2002-09-08', f1 ) ), 24 ) from t1;
drop table t1;

#
# MDEV-9682 Assertion `0' failed in Item_cache_row::illegal_method_call on 2nd execution of PS with NULLIF
#
CREATE TABLE t1 (f1 INT);
INSERT INTO t1 VALUES (1),(2);
PREPARE stmt FROM "SELECT * FROM t1 WHERE NULLIF( ( 1, 2 ) IN ( SELECT 3, 4 ), 1 )";
EXECUTE stmt;
EXECUTE stmt;
DROP TABLE t1;

#
# MDEV-9683 Server crashes in Item::basic_const_item on numerous nested NULLIFs
#
CREATE TABLE t1 (i INT);
INSERT INTO t1 VALUES (1),(2);
SELECT * FROM t1 WHERE NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(NULLIF(i = ROUND(0), 14), 13), 12), 11), 10), 9), 8), 7), 6), 5), 4), 3), 2), 1);
DROP TABLE t1;

--echo #
--echo # MDEV-10347 mysqld got signal 11
--echo #

CREATE TABLE t1 (f1 VARCHAR(10), f2 VARCHAR(40));
CREATE TABLE t2 (f3 VARCHAR(20));
PREPARE stmt FROM "
  SELECT (
    SELECT IFNULL(f3,4) FROM t2
    WHERE IFNULL(NULLIF(f1,''),1)
  ) AS sq
  FROM t1
  GROUP BY f2
";
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
DROP TABLE t2,t1;

--echo #
--echo # MDEV-10236 Where expression with NOT function gives incorrect result
--echo #
CREATE TABLE t1 (c1 INT);
INSERT INTO t1 VALUES (1),(2),(3);
EXPLAIN EXTENDED
SELECT * FROM t1 WHERE ((c1 IS NOT NULL) >= (NOT TRUE)) IS NOT NULL;
SELECT * FROM t1 WHERE ((c1 IS NOT NULL) >= (NOT TRUE)) IS NOT NULL;
DROP TABLE t1;


--echo #
--echo # End of 10.1 tests
--echo #