set tidb_cost_model_version=1;
# prepare database
create database collation_misc;
use collation_misc;

# ChangingCharsetToUtf8
create table t1(a varchar(20) charset utf8);
insert into t1 values ("t1_value");
alter table t1 collate uTf8mB4_uNiCoDe_Ci charset Utf8mB4 charset uTF8Mb4 collate UTF8MB4_BiN;
alter table t1 modify column a varchar(20) charset utf8mb4;
select * from t1;
create table t(a varchar(20) charset latin1);
insert into t values ("t_value");
alter table t modify column a varchar(20) charset latin1;
select * from t;

--error 8200
alter table t modify column a varchar(20) charset utf8;

drop table t;
create table t(a varchar(20) charset latin1);
insert into t values ("t_value");
alter table t modify column a varchar(20) charset utf8mb4;
admin check table t;
select * from t;

drop table t;
create table t(a varchar(20) charset latin1);
insert into t values ("t_value");
alter table t modify column a varchar(20) charset utf8mb4 collate utf8mb4_general_ci;
admin check table t;
select * from t;

drop table t;
create table t(a varchar(20) charset latin1);
insert into t values ("t_value");
--error 8200
alter table t modify column a varchar(20) charset utf8 collate utf8_bin;
--error 1273
alter table t modify column a varchar(20) charset utf8mb4 collate utf8bin;
--error 1302, 1273
alter table t collate LATIN1_GENERAL_CI charset utf8 collate utf8_bin;
--error 1253, 1273
alter table t collate LATIN1_GENERAL_CI collate UTF8MB4_UNICODE_ci collate utf8_bin;

# ChangingCharsetToUtf8 with reorg
drop table t;
create table t(a varchar(20) charset latin1);
insert into t values ("t_value");
alter table t modify column a varchar(19) charset utf8mb4;
admin check table t;
select * from t;

# TestCharsetDatabase
create database if not exists cd_test_utf8 CHARACTER SET utf8 COLLATE utf8_bin;
--error 1273
create database if not exists cd_test_latin1 CHARACTER SET latin1 COLLATE latin1_swedish_ci;
use cd_test_utf8;
select @@character_set_database;
select @@collation_database;
--error 1049
use cd_test_latin1;
select @@character_set_database;
select @@collation_database;

# DefaultDBAfterDropCurDB
--error 1273
create database if not exists test_db CHARACTER SET latin1 COLLATE latin1_swedish_ci;

# CollationUnion
with cte as (select cast('2010-09-09' as date) a union select  '2010-09-09  ') select count(*) from cte;

# Issue26989
set names utf8mb4 collate utf8mb4_general_ci;
select position('a' in 'AA');
select locate('a', 'AA');
select locate('a', 'a');
set names utf8mb4;

# CharacterSetCollations
SELECT default_collate_name, maxlen FROM information_schema.character_sets ORDER BY character_set_name;
SELECT character_set_name, id, sortlen FROM information_schema.collations ORDER BY collation_name, id;
select * from information_schema.COLLATION_CHARACTER_SET_APPLICABILITY where COLLATION_NAME='utf8mb4_bin';

# charset
show charset;
show collation;

use test;