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("");

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 INTO t1 SET a = "", d= "2003-01-14 03:54:55";
UPDATE t1 SET d=1/NULL;
UPDATE t1 SET d=NULL;
--error 1048
INSERT INTO t1 (a) values (null);
--error 1048
INSERT INTO t1 (a) values (1/null);
INSERT INTO t1 (a) values (null),(null);
--error 1048
INSERT INTO t1 (b) values (null);
--error 1048
INSERT INTO t1 (b) values (1/null);
INSERT INTO t1 (b) values (null),(null);
--error 1048
INSERT INTO t1 (c) values (null);
--error 1048
INSERT INTO t1 (c) values (1/null);
INSERT INTO t1 (c) values (null),(null);
--error 1048
INSERT INTO t1 (d) values (null);
--error 1048
INSERT INTO t1 (d) values (1/null);
INSERT 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;
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);

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;

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;

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;

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;

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
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 # End of 10.1 tests
--echo #