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MDEV-25829 Change default Unicode collation to uca1400_ai_ci

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Step#2 - Adding a new collation derivation level for CAST and CONVERT.

Now character string cast functions:
  - CAST(string_expr AS CHAR)
  - CONVERT(expr USING charset_name)

have a new collation derivation level between:

  - string literals
  - utf8 metadata functions, e.g. user() and database()

Before the change these cast functions had collation derivation equal
to table columns, which caused more illegal mix of collation conflicts.

Note, binary string cast functions:
  - BINARY(expr)
  - CAST(string_expr AS BINARY)
  - CONVERT(expr USING binary)
did not change their collation derivation, to preserve the behaviour of
queries like these:
SELECT database()=BINARY'test';
SELECT user()=CAST('root' AS BINARY);
SELECT current_role()=CONVERT('role' USING binary);

Derivation levels after the change look as follows:

  DERIVATION_IGNORABLE= 7, // Explicit NULL

  DERIVATION_NUMERIC= 6,   // Numbers in string context,
                           // Numeric user variables
                           // CAST(numeric_expr AS CHAR)

  DERIVATION_COERCIBLE= 5, // Literals, string user variables

  DERIVATION_CAST= 4,      // CAST(string_expr AS CHAR),
                           // CONVERT(string_expr USING cs)

  DERIVATION_SYSCONST= 3,  // utf8 metadata functions, e.g. user(), database()
  DERIVATION_IMPLICIT= 2,  // Table columns, SP variables, BINARY(expr)
  DERIVATION_NONE= 1,      // A mix (e.g. CONCAT) of two differrent collations
  DERIVATION_EXPLICIT= 0   // An explicit COLLATE clause
This commit is contained in:
Alexander Barkov
2023-11-15 10:14:28 +04:00
parent 1b65cc9da7
commit a3117c7983
31 changed files with 218 additions and 121 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
mysql-test/main/ctype_binary.result
View File

@ -423,7 +423,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select hex(concat(coercibility('a')));
hex(concat(coercibility('a')))
34
35
create table t1 as select concat(coercibility('a')) as c1;
show create table t1;
Table Create Table
@ -811,7 +811,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select coercibility(uuid()), coercibility(cast('a' as char character set latin1));
coercibility(uuid()) coercibility(cast('a' as char character set latin1))
5 2
6 4
select charset(concat(uuid(), cast('a' as char character set latin1)));
charset(concat(uuid(), cast('a' as char character set latin1)))
latin1

10
mysql-test/main/ctype_collate.result
View File

@ -514,7 +514,7 @@ Variable_name Value
character_set_client latin1
SELECT charset('a'),collation('a'),coercibility('a'),'a'='A';
charset('a') collation('a') coercibility('a') 'a'='A'
latin1 latin1_swedish_ci 4 1
latin1 latin1_swedish_ci 5 1
explain extended SELECT charset('a'),collation('a'),coercibility('a'),'a'='A';
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
@ -525,7 +525,7 @@ SHOW VARIABLES LIKE 'collation_client';
Variable_name Value
SELECT charset('a'),collation('a'),coercibility('a'),'a'='A';
charset('a') collation('a') coercibility('a') 'a'='A'
latin1 latin1_swedish_ci 4 1
latin1 latin1_swedish_ci 5 1
SET CHARACTER SET 'DEFAULT';
ERROR 42000: Unknown character set: 'DEFAULT'
DROP TABLE t1;
@ -683,7 +683,7 @@ RETURN "Testtext";
END;//
SELECT getText(), CHARSET(getText()), COLLATION(getText()), COERCIBILITY(getText());
getText() CHARSET(getText()) COLLATION(getText()) COERCIBILITY(getText())
Testtext latin1 latin1_swedish_ci 4
Testtext latin1 latin1_swedish_ci 5
CREATE TABLE t1 AS SELECT ' - ' AS a UNION SELECT getText();
ERROR HY000: Illegal mix of collations for operation 'UNION'
DROP FUNCTION getText;
@ -696,7 +696,7 @@ RETURN "Testtext";
END;//
SELECT getText(), CHARSET(getText()), COLLATION(getText()), COERCIBILITY(getText());
getText() CHARSET(getText()) COLLATION(getText()) COERCIBILITY(getText())
Testtext latin1 latin1_german2_ci 4
Testtext latin1 latin1_german2_ci 5
CREATE TABLE t1 AS SELECT ' - ' AS a UNION SELECT getText();
SHOW CREATE TABLE t1;
Table Create Table
@ -714,7 +714,7 @@ RETURN "Testtext";
END;//
SELECT getText(), CHARSET(getText()), COLLATION(getText()), COERCIBILITY(getText());
getText() CHARSET(getText()) COLLATION(getText()) COERCIBILITY(getText())
Testtext latin1 latin1_german2_ci 4
Testtext latin1 latin1_german2_ci 5
CREATE TABLE t1 AS SELECT ' - ' AS a UNION SELECT getText();
SHOW CREATE TABLE t1;
Table Create Table

4
mysql-test/main/ctype_cp1251.result
View File

@ -835,7 +835,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select hex(concat(coercibility('a')));
hex(concat(coercibility('a')))
34
35
create table t1 as select concat(coercibility('a')) as c1;
show create table t1;
Table Create Table
@ -1223,7 +1223,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select coercibility(uuid()), coercibility(cast('a' as char character set latin1));
coercibility(uuid()) coercibility(cast('a' as char character set latin1))
5 2
6 4
select charset(concat(uuid(), cast('a' as char character set latin1)));
charset(concat(uuid(), cast('a' as char character set latin1)))
latin1

4
mysql-test/main/ctype_latin1.result
View File

@ -1144,7 +1144,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select hex(concat(coercibility('a')));
hex(concat(coercibility('a')))
34
35
create table t1 as select concat(coercibility('a')) as c1;
show create table t1;
Table Create Table
@ -1532,7 +1532,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select coercibility(uuid()), coercibility(cast('a' as char character set latin1));
coercibility(uuid()) coercibility(cast('a' as char character set latin1))
5 2
6 4
select charset(concat(uuid(), cast('a' as char character set latin1)));
charset(concat(uuid(), cast('a' as char character set latin1)))
latin1

12
mysql-test/main/ctype_latin2.result
View File

@ -585,31 +585,31 @@ CHARSET('2013-11-15 00:41:28' - INTERVAL 7 DAY)
latin2
SELECT COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY)
4
5
SELECT CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
binary
SELECT COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
5
6
SELECT CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
latin2
SELECT COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
latin2
SELECT COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
latin2
SELECT COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
323030312D30312D30312030303A30303A3030
@ -618,7 +618,7 @@ CHARSET(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
latin2
SELECT COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
323030312D30312D30312030303A30303A3030

16
mysql-test/main/ctype_ucs.result
View File

@ -2024,7 +2024,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select hex(concat(coercibility('a')));
hex(concat(coercibility('a')))
0034
0035
create table t1 as select concat(coercibility('a')) as c1;
show create table t1;
Table Create Table
@ -2412,7 +2412,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select coercibility(uuid()), coercibility(cast('a' as char character set latin1));
coercibility(uuid()) coercibility(cast('a' as char character set latin1))
5 2
6 4
select charset(concat(uuid(), cast('a' as char character set latin1)));
charset(concat(uuid(), cast('a' as char character set latin1)))
latin1
@ -5191,31 +5191,31 @@ CHARSET('2013-11-15 00:41:28' - INTERVAL 7 DAY)
ucs2
SELECT COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY)
4
5
SELECT CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
binary
SELECT COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
5
6
SELECT CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
ucs2
SELECT COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
ucs2
SELECT COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
ucs2
SELECT COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
0032003000300031002D00300031002D00300031002000300030003A00300030003A00300030
@ -5224,7 +5224,7 @@ CHARSET(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
ucs2
SELECT COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
0032003000300031002D00300031002D00300031002000300030003A00300030003A00300030

12
mysql-test/main/ctype_utf16.result
View File

@ -1392,31 +1392,31 @@ CHARSET('2013-11-15 00:41:28' - INTERVAL 7 DAY)
utf16
SELECT COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY)
4
5
SELECT CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
binary
SELECT COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
5
6
SELECT CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
utf16
SELECT COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
utf16
SELECT COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
utf16
SELECT COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
0032003000300031002D00300031002D00300031002000300030003A00300030003A00300030
@ -1425,7 +1425,7 @@ CHARSET(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
utf16
SELECT COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
0032003000300031002D00300031002D00300031002000300030003A00300030003A00300030

12
mysql-test/main/ctype_utf16le.result
View File

@ -1663,31 +1663,31 @@ CHARSET('2013-11-15 00:41:28' - INTERVAL 7 DAY)
utf16le
SELECT COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY)
4
5
SELECT CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
binary
SELECT COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
5
6
SELECT CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
utf16le
SELECT COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
utf16le
SELECT COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
utf16le
SELECT COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
32003000300031002D00300031002D00300031002000300030003A00300030003A0030003000
@ -1696,7 +1696,7 @@ CHARSET(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
utf16le
SELECT COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
32003000300031002D00300031002D00300031002000300030003A00300030003A0030003000

12
mysql-test/main/ctype_utf32.result
View File

@ -1339,31 +1339,31 @@ CHARSET('2013-11-15 00:41:28' - INTERVAL 7 DAY)
utf32
SELECT COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY('2013-11-15 00:41:28' - INTERVAL 7 DAY)
4
5
SELECT CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
CHARSET(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
binary
SELECT COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY);
COERCIBILITY(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY)
5
6
SELECT CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
utf32
SELECT COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
CHARSET(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
utf32
SELECT COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT(TIMESTAMP'2013-11-15 00:41:28' - INTERVAL 7 DAY))
4
5
SELECT CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
CHARSET(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
utf32
SELECT COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('','2001-01-08 00:00:00' - INTERVAL 7 DAY))
000000320000003000000030000000310000002D00000030000000310000002D00000030000000310000002000000030000000300000003A00000030000000300000003A0000003000000030
@ -1372,7 +1372,7 @@ CHARSET(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
utf32
SELECT COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
COERCIBILITY(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
4
5
SELECT HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY));
HEX(CONCAT('',TIMESTAMP'2001-01-08 00:00:00' - INTERVAL 7 DAY))
000000320000003000000030000000310000002D00000030000000310000002D00000030000000310000002000000030000000300000003A00000030000000300000003A0000003000000030

6
mysql-test/main/ctype_utf8.result
View File

@ -2016,7 +2016,7 @@ insert into t1 values('t1_val');
create view v1 as select 'v1_val' as col1;
select coercibility(col1), collation(col1) from v1;
coercibility(col1) collation(col1)
4 utf8mb3_general_ci
5 utf8mb3_general_ci
create view v2 as select col1 from v1 union select col1 from t1;
select coercibility(col1), collation(col1)from v2;
coercibility(col1) collation(col1)
@ -2896,7 +2896,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select hex(concat(coercibility('a')));
hex(concat(coercibility('a')))
34
35
create table t1 as select concat(coercibility('a')) as c1;
show create table t1;
Table Create Table
@ -3284,7 +3284,7 @@ t1 CREATE TABLE `t1` (
drop table t1;
select coercibility(uuid()), coercibility(cast('a' as char character set latin1));
coercibility(uuid()) coercibility(cast('a' as char character set latin1))
5 2
6 4
select charset(concat(uuid(), cast('a' as char character set latin1)));
charset(concat(uuid(), cast('a' as char character set latin1)))
latin1

2
mysql-test/main/ctype_utf8mb4.result
View File

@ -2042,7 +2042,7 @@ insert into t1 values('t1_val');
create view v1 as select 'v1_val' as col1;
select coercibility(col1), collation(col1) from v1;
coercibility(col1) collation(col1)
4 utf8mb4_general_ci
5 utf8mb4_general_ci
create view v2 as select col1 from v1 union select col1 from t1;
select coercibility(col1), collation(col1)from v2;
coercibility(col1) collation(col1)

2
mysql-test/main/ctype_utf8mb4_heap.result
View File

@ -1874,7 +1874,7 @@ insert into t1 values('t1_val');
create view v1 as select 'v1_val' as col1;
select coercibility(col1), collation(col1) from v1;
coercibility(col1) collation(col1)
4 utf8mb4_general_ci
5 utf8mb4_general_ci
create view v2 as select col1 from v1 union select col1 from t1;
select coercibility(col1), collation(col1)from v2;
coercibility(col1) collation(col1)

2
mysql-test/main/ctype_utf8mb4_innodb.result
View File

@ -2000,7 +2000,7 @@ insert into t1 values('t1_val');
create view v1 as select 'v1_val' as col1;
select coercibility(col1), collation(col1) from v1;
coercibility(col1) collation(col1)
4 utf8mb4_general_ci
5 utf8mb4_general_ci
create view v2 as select col1 from v1 union select col1 from t1;
select coercibility(col1), collation(col1)from v2;
coercibility(col1) collation(col1)

2
mysql-test/main/ctype_utf8mb4_myisam.result
View File

@ -2007,7 +2007,7 @@ insert into t1 values('t1_val');
create view v1 as select 'v1_val' as col1;
select coercibility(col1), collation(col1) from v1;
coercibility(col1) collation(col1)
4 utf8mb4_general_ci
5 utf8mb4_general_ci
create view v2 as select col1 from v1 union select col1 from t1;
select coercibility(col1), collation(col1)from v2;
coercibility(col1) collation(col1)

2
mysql-test/main/default.result
View File

@ -2969,7 +2969,7 @@ t1 CREATE TABLE `t1` (
INSERT INTO t1 (a) VALUES ('test');
SELECT * FROM t1;
a b c
test 2 5
test 2 6
DROP TABLE t1;
#
# String result metadata functions

4
mysql-test/main/func_misc.result
View File

@ -1477,10 +1477,10 @@ COERCIBILITY(NAME_CONST('name','test'))
2
SELECT COERCIBILITY(NAME_CONST('name',TIME'00:00:00'));
COERCIBILITY(NAME_CONST('name',TIME'00:00:00'))
5
6
SELECT COERCIBILITY(NAME_CONST('name',15));
COERCIBILITY(NAME_CONST('name',15))
5
6
SELECT CONCAT(NAME_CONST('name',15),'오');
CONCAT(NAME_CONST('name',15),'오')
15오

99
mysql-test/main/func_str.result
View File

@ -608,103 +608,103 @@ select _latin1'B' COLLATE latin1_general_ci in (_latin1'a',_latin1'b' COLLATE la
ERROR HY000: Illegal mix of collations (latin1_general_ci,EXPLICIT), (latin1_swedish_ci,COERCIBLE), (latin1_bin,EXPLICIT) for operation 'in'
select collation(bin(130)), coercibility(bin(130));
collation(bin(130)) coercibility(bin(130))
latin1_swedish_ci 4
latin1_swedish_ci 5
select collation(oct(130)), coercibility(oct(130));
collation(oct(130)) coercibility(oct(130))
latin1_swedish_ci 4
latin1_swedish_ci 5
select collation(conv(130,16,10)), coercibility(conv(130,16,10));
collation(conv(130,16,10)) coercibility(conv(130,16,10))
latin1_swedish_ci 4
latin1_swedish_ci 5
select collation(hex(130)), coercibility(hex(130));
collation(hex(130)) coercibility(hex(130))
latin1_swedish_ci 4
latin1_swedish_ci 5
select collation(char(130)), coercibility(hex(130));
collation(char(130)) coercibility(hex(130))
binary 4
binary 5
select collation(format(130,10)), coercibility(format(130,10));
collation(format(130,10)) coercibility(format(130,10))
latin1_swedish_ci 4
latin1_swedish_ci 5
select collation(lcase(_latin2'a')), coercibility(lcase(_latin2'a'));
collation(lcase(_latin2'a')) coercibility(lcase(_latin2'a'))
latin2_general_ci 4
latin2_general_ci 5
select collation(ucase(_latin2'a')), coercibility(ucase(_latin2'a'));
collation(ucase(_latin2'a')) coercibility(ucase(_latin2'a'))
latin2_general_ci 4
latin2_general_ci 5
select collation(left(_latin2'a',1)), coercibility(left(_latin2'a',1));
collation(left(_latin2'a',1)) coercibility(left(_latin2'a',1))
latin2_general_ci 4
latin2_general_ci 5
select collation(right(_latin2'a',1)), coercibility(right(_latin2'a',1));
collation(right(_latin2'a',1)) coercibility(right(_latin2'a',1))
latin2_general_ci 4
latin2_general_ci 5
select collation(substring(_latin2'a',1,1)), coercibility(substring(_latin2'a',1,1));
collation(substring(_latin2'a',1,1)) coercibility(substring(_latin2'a',1,1))
latin2_general_ci 4
latin2_general_ci 5
select collation(concat(_latin2'a',_latin2'b')), coercibility(concat(_latin2'a',_latin2'b'));
collation(concat(_latin2'a',_latin2'b')) coercibility(concat(_latin2'a',_latin2'b'))
latin2_general_ci 4
latin2_general_ci 5
select collation(lpad(_latin2'a',4,_latin2'b')), coercibility(lpad(_latin2'a',4,_latin2'b'));
collation(lpad(_latin2'a',4,_latin2'b')) coercibility(lpad(_latin2'a',4,_latin2'b'))
latin2_general_ci 4
latin2_general_ci 5
select collation(lpad(_latin2'a',4)), coercibility(lpad(_latin2'a',4));
collation(lpad(_latin2'a',4)) coercibility(lpad(_latin2'a',4))
latin2_general_ci 4
latin2_general_ci 5
select collation(rpad(_latin2'a',4,_latin2'b')), coercibility(rpad(_latin2'a',4,_latin2'b'));
collation(rpad(_latin2'a',4,_latin2'b')) coercibility(rpad(_latin2'a',4,_latin2'b'))
latin2_general_ci 4
latin2_general_ci 5
select collation(rpad(_latin2'a',4)), coercibility(rpad(_latin2'a',4));
collation(rpad(_latin2'a',4)) coercibility(rpad(_latin2'a',4))
latin2_general_ci 4
latin2_general_ci 5
select collation(concat_ws(_latin2'a',_latin2'b')), coercibility(concat_ws(_latin2'a',_latin2'b'));
collation(concat_ws(_latin2'a',_latin2'b')) coercibility(concat_ws(_latin2'a',_latin2'b'))
latin2_general_ci 4
latin2_general_ci 5
select collation(make_set(255,_latin2'a',_latin2'b',_latin2'c')), coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'));
collation(make_set(255,_latin2'a',_latin2'b',_latin2'c')) coercibility(make_set(255,_latin2'a',_latin2'b',_latin2'c'))
latin2_general_ci 4
latin2_general_ci 5
select collation(export_set(255,_latin2'y',_latin2'n',_latin2' ')), coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '));
collation(export_set(255,_latin2'y',_latin2'n',_latin2' ')) coercibility(export_set(255,_latin2'y',_latin2'n',_latin2' '))
latin2_general_ci 4
latin2_general_ci 5
select collation(trim(_latin2' a ')), coercibility(trim(_latin2' a '));
collation(trim(_latin2' a ')) coercibility(trim(_latin2' a '))
latin2_general_ci 4
latin2_general_ci 5
select collation(ltrim(_latin2' a ')), coercibility(ltrim(_latin2' a '));
collation(ltrim(_latin2' a ')) coercibility(ltrim(_latin2' a '))
latin2_general_ci 4
latin2_general_ci 5
select collation(rtrim(_latin2' a ')), coercibility(rtrim(_latin2' a '));
collation(rtrim(_latin2' a ')) coercibility(rtrim(_latin2' a '))
latin2_general_ci 4
latin2_general_ci 5
select collation(trim(LEADING _latin2' ' FROM _latin2'a')), coercibility(trim(LEADING _latin2'a' FROM _latin2'a'));
collation(trim(LEADING _latin2' ' FROM _latin2'a')) coercibility(trim(LEADING _latin2'a' FROM _latin2'a'))
latin2_general_ci 4
latin2_general_ci 5
select collation(trim(TRAILING _latin2' ' FROM _latin2'a')), coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'));
collation(trim(TRAILING _latin2' ' FROM _latin2'a')) coercibility(trim(TRAILING _latin2'a' FROM _latin2'a'))
latin2_general_ci 4
latin2_general_ci 5
select collation(trim(BOTH _latin2' ' FROM _latin2'a')), coercibility(trim(BOTH _latin2'a' FROM _latin2'a'));
collation(trim(BOTH _latin2' ' FROM _latin2'a')) coercibility(trim(BOTH _latin2'a' FROM _latin2'a'))
latin2_general_ci 4
latin2_general_ci 5
select collation(repeat(_latin2'a',10)), coercibility(repeat(_latin2'a',10));
collation(repeat(_latin2'a',10)) coercibility(repeat(_latin2'a',10))
latin2_general_ci 4
latin2_general_ci 5
select collation(reverse(_latin2'ab')), coercibility(reverse(_latin2'ab'));
collation(reverse(_latin2'ab')) coercibility(reverse(_latin2'ab'))
latin2_general_ci 4
latin2_general_ci 5
select collation(quote(_latin2'ab')), coercibility(quote(_latin2'ab'));
collation(quote(_latin2'ab')) coercibility(quote(_latin2'ab'))
latin2_general_ci 4
latin2_general_ci 5
select collation(soundex(_latin2'ab')), coercibility(soundex(_latin2'ab'));
collation(soundex(_latin2'ab')) coercibility(soundex(_latin2'ab'))
latin2_general_ci 4
latin2_general_ci 5
select collation(substring(_latin2'ab',1)), coercibility(substring(_latin2'ab',1));
collation(substring(_latin2'ab',1)) coercibility(substring(_latin2'ab',1))
latin2_general_ci 4
latin2_general_ci 5
select collation(insert(_latin2'abcd',2,3,_latin2'ef')), coercibility(insert(_latin2'abcd',2,3,_latin2'ef'));
collation(insert(_latin2'abcd',2,3,_latin2'ef')) coercibility(insert(_latin2'abcd',2,3,_latin2'ef'))
latin2_general_ci 4
latin2_general_ci 5
select collation(replace(_latin2'abcd',_latin2'b',_latin2'B')), coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'));
collation(replace(_latin2'abcd',_latin2'b',_latin2'B')) coercibility(replace(_latin2'abcd',_latin2'b',_latin2'B'))
latin2_general_ci 4
latin2_general_ci 5
select collation(encode('abcd','ab')), coercibility(encode('abcd','ab'));
collation(encode('abcd','ab')) coercibility(encode('abcd','ab'))
binary 4
binary 5
create table t1
select
bin(130),
@ -787,7 +787,7 @@ latin2 latin2_general_ci 2
drop table t1;
select charset(null), collation(null), coercibility(null);
charset(null) collation(null) coercibility(null)
binary binary 6
binary binary 7
CREATE TABLE t1 (a int, b int);
CREATE TABLE t2 (a int, b int);
INSERT INTO t1 VALUES (1,1),(2,2);
@ -803,7 +803,7 @@ a b a b
1 1 NULL NULL
2 2 2 2
select t1.*,t2.* from t1 left join t2 on (t1.b=t2.b)
where coercibility(t2.a) = 5 order by t1.a,t2.a;
where coercibility(t2.a) = 6 order by t1.a,t2.a;
a b a b
1 1 NULL NULL
2 2 2 2
@ -5663,3 +5663,32 @@ CONV(-9223372036854775808, -10, -62)
#
# End of 11.4 tests
#
#
# Start of 11.5 tests
#
#
# MDEV-25829 Change default collation to utf8mb4_1400_ai_ci
#
SELECT
coercibility(CAST(1 AS CHAR)),
coercibility(CONVERT('a' USING latin1));
coercibility(CAST(1 AS CHAR)) 4
coercibility(CONVERT('a' USING latin1)) 4
SELECT
coercibility(CAST(1 AS BINARY)),
coercibility(CONVERT('a' USING binary)),
coercibility(binary'a');
coercibility(CAST(1 AS BINARY)) 2
coercibility(CONVERT('a' USING binary)) 2
coercibility(binary'a') 2
EXPLAIN EXTENDED SELECT
CAST(1 AS BINARY) AS c,
CONVERT('a' USING binary),
BINARY'a';
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select cast(1 as char charset binary) AS `c`,convert('a' using binary) AS `CONVERT('a' USING binary)`,cast('a' as char charset binary) AS `BINARY'a'`
#
# End of 11.5 tests
#

31
mysql-test/main/func_str.test
View File

@ -485,7 +485,7 @@ where collation(t2.a) = _utf8'binary' order by t1.a,t2.a;
select t1.*,t2.* from t1 left join t2 on (t1.b=t2.b)
where charset(t2.a) = _utf8'binary' order by t1.a,t2.a;
select t1.*,t2.* from t1 left join t2 on (t1.b=t2.b)
where coercibility(t2.a) = 5 order by t1.a,t2.a;
where coercibility(t2.a) = 6 order by t1.a,t2.a;
DROP TABLE t1, t2;
#
@ -2571,3 +2571,32 @@ SELECT CONV(-9223372036854775808, -10, -62);
--echo #
--echo # End of 11.4 tests
--echo #
--echo #
--echo # Start of 11.5 tests
--echo #
--echo #
--echo # MDEV-25829 Change default collation to utf8mb4_1400_ai_ci
--echo #
--vertical_results
SELECT
coercibility(CAST(1 AS CHAR)),
coercibility(CONVERT('a' USING latin1));
SELECT
coercibility(CAST(1 AS BINARY)),
coercibility(CONVERT('a' USING binary)),
coercibility(binary'a');
--horizontal_results
EXPLAIN EXTENDED SELECT
CAST(1 AS BINARY) AS c,
CONVERT('a' USING binary),
BINARY'a';
--echo #
--echo # End of 11.5 tests
--echo #

2
mysql-test/main/func_time.result
View File

@ -638,7 +638,7 @@ LOWER(MONTHNAME(19700101))
january
SELECT COERCIBILITY(MONTHNAME('1970-01-01')),COERCIBILITY(DAYNAME('1970-01-01'));
COERCIBILITY(MONTHNAME('1970-01-01')) COERCIBILITY(DAYNAME('1970-01-01'))
4 4
5 5
CREATE TABLE t1 (datetime datetime, timestamp timestamp, date date, time time);
INSERT INTO t1 values ("2001-01-02 03:04:05", "2002-01-02 03:04:05", "2003-01-02", "06:07:08");
SELECT * from t1;

2
mysql-test/main/func_weight_string.result
View File

@ -69,7 +69,7 @@ weight_string reverse
1 2
select coercibility(weight_string('test'));
coercibility(weight_string('test'))
4
5
select coercibility(weight_string('test' collate latin1_swedish_ci));
coercibility(weight_string('test' collate latin1_swedish_ci))
0

4
mysql-test/main/get_diagnostics.result
View File

@ -774,10 +774,10 @@ Warning 1916 Got overflow when converting '-19999999999999999999' to INT. Value
GET DIAGNOSTICS CONDITION 1 @var1 = MESSAGE_TEXT, @var2 = CLASS_ORIGIN;
SELECT CHARSET(@var1), COLLATION(@var1), COERCIBILITY(@var1);
CHARSET(@var1) COLLATION(@var1) COERCIBILITY(@var1)
utf8mb3 utf8mb3_general_ci 4
utf8mb3 utf8mb3_general_ci 5
SELECT CHARSET(@var2), COLLATION(@var2), COERCIBILITY(@var2);
CHARSET(@var2) COLLATION(@var2) COERCIBILITY(@var2)
utf8mb3 utf8mb3_general_ci 4
utf8mb3 utf8mb3_general_ci 5
#
# Command statistics
#

2
mysql-test/main/gis.result
View File

@ -4885,7 +4885,7 @@ UNCOMPRESSED_LENGTH(POINT(1,1))
0
SELECT COERCIBILITY(POINT(1,1));
COERCIBILITY(POINT(1,1))
4
5
SELECT ASCII(POINT(1,1));
ASCII(POINT(1,1))
0

2
mysql-test/main/metadata.result
View File

@ -426,7 +426,7 @@ def ORD('a') 3 7 2 N 32897 0 63
def CRC32('a') 3 10 10 N 32929 0 63
def UNCOMPRESSED_LENGTH(COMPRESS('a')) 3 10 1 Y 32896 0 63
STRCMP('a','b') OCTET_LENGTH('a') CHAR_LENGTH('a') COERCIBILITY('a') ASCII('a') ORD('a') CRC32('a') UNCOMPRESSED_LENGTH(COMPRESS('a'))
-1 1 1 4 97 97 3904355907 1
-1 1 1 5 97 97 3904355907 1
SELECT
INTERVAL(2,1,2,3),
REGEXP_INSTR('a','a'),

10
mysql-test/main/ps.result
View File

@ -5175,19 +5175,19 @@ CHARSET(CONCAT(?,_latin1'a'))
latin1
EXECUTE IMMEDIATE "SELECT COERCIBILITY(?)" USING 5;
COERCIBILITY(?)
5
6
EXECUTE IMMEDIATE "SELECT COERCIBILITY(?)" USING 5.5;
COERCIBILITY(?)
5
6
EXECUTE IMMEDIATE "SELECT COERCIBILITY(?)" USING 5.5e0;
COERCIBILITY(?)
5
6
EXECUTE IMMEDIATE "SELECT COERCIBILITY(?)" USING TIME'10:20:30';
COERCIBILITY(?)
5
6
EXECUTE IMMEDIATE "SELECT COERCIBILITY(?)" USING TIMESTAMP'2001-01-01 10:20:30';
COERCIBILITY(?)
5
6
#
# MDEV-14435 Different UNSIGNED flag of out user variable for YEAR parameter for direct vs prepared CALL
#

2
mysql-test/main/type_blob.result
View File

@ -520,7 +520,7 @@ charset(load_file('../../std_data/words.dat')),
collation(load_file('../../std_data/words.dat')),
coercibility(load_file('../../std_data/words.dat'));
charset(load_file('../../std_data/words.dat')) collation(load_file('../../std_data/words.dat')) coercibility(load_file('../../std_data/words.dat'))
binary binary 4
binary binary 5
explain extended select
charset(load_file('MYSQLTEST_VARDIR/std_data/words.dat')),
collation(load_file('MYSQLTEST_VARDIR/std_data/words.dat')),

14
mysql-test/main/user_var.result
View File

@ -137,7 +137,7 @@ drop table t1;
set @a=_latin2'test';
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_general_ci 4
latin2 latin2_general_ci 5
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
@ -147,7 +147,7 @@ select @a=_latin2'TEST' collate latin2_bin;
set @a=_latin2'test' collate latin2_general_ci;
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_general_ci 4
latin2 latin2_general_ci 5
select @a=_latin2'TEST';
@a=_latin2'TEST'
1
@ -162,19 +162,19 @@ collation(@a:=_latin2'test')
latin2_general_ci
select coercibility(@a:=_latin2'test');
coercibility(@a:=_latin2'test')
4
5
select collation(@a:=_latin2'test' collate latin2_bin);
collation(@a:=_latin2'test' collate latin2_bin)
latin2_bin
select coercibility(@a:=_latin2'test' collate latin2_bin);
coercibility(@a:=_latin2'test' collate latin2_bin)
4
5
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST';
(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST'
0
select charset(@a),collation(@a),coercibility(@a);
charset(@a) collation(@a) coercibility(@a)
latin2 latin2_bin 4
latin2 latin2_bin 5
select (@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci;
(@a:=_latin2'test' collate latin2_bin) = _latin2'TEST' collate latin2_general_ci
1
@ -184,11 +184,11 @@ my_column
0
select @v, coercibility(@v);
@v coercibility(@v)
NULL 4
NULL 5
set @v1=null, @v2=1, @v3=1.1, @v4=now();
select coercibility(@v1),coercibility(@v2),coercibility(@v3),coercibility(@v4);
coercibility(@v1) coercibility(@v2) coercibility(@v3) coercibility(@v4)
4 5 5 4
5 6 6 5
set session @honk=99;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '@honk=99' at line 1
select @@local.max_allowed_packet;

5
sql/item.cc
View File

@ -2390,10 +2390,7 @@ left_is_superset(const DTCollation *left, const DTCollation *right)
Aggregate two collations together taking
into account their coercibility (aka derivation):.
0 == DERIVATION_EXPLICIT - an explicitly written COLLATE clause @n
1 == DERIVATION_NONE - a mix of two different collations @n
2 == DERIVATION_IMPLICIT - a column @n
3 == DERIVATION_COERCIBLE - a string constant.
See the definition of enum Derivation for details.
The most important rules are:
-# If collations are the same:

4
sql/item_strfunc.cc
View File

@ -4017,7 +4017,9 @@ String *Item_func_conv_charset::val_str(String *str)
bool Item_func_conv_charset::fix_length_and_dec(THD *thd)
{
DBUG_ASSERT(collation.derivation == DERIVATION_IMPLICIT);
DBUG_ASSERT(collation.derivation == DERIVATION_CAST ||
(collation.derivation == DERIVATION_IMPLICIT &&
collation.collation == &my_charset_bin));
fix_char_length(args[0]->max_char_length());
return FALSE;
}

4
sql/item_strfunc.h
View File

@ -1893,13 +1893,13 @@ public:
Item_func_conv_charset(THD *thd, Item *a, CHARSET_INFO *cs):
Item_str_func(thd, a)
{
collation.set(cs, DERIVATION_IMPLICIT);
collation= DTCollation::string_typecast(cs);
use_cached_value= 0; safe= 0;
}
Item_func_conv_charset(THD *thd, Item *a, CHARSET_INFO *cs, bool cache_if_const):
Item_str_func(thd, a)
{
collation.set(cs, DERIVATION_IMPLICIT);
collation= DTCollation::string_typecast(cs);
if (cache_if_const && args[0]->can_eval_in_optimize())
{
uint errors= 0;

2
sql/item_timefunc.cc
View File

@ -3376,7 +3376,7 @@ void Item_char_typecast::fix_length_and_dec_internal(CHARSET_INFO *from_cs)
(!my_charset_same(from_cs, cast_cs) &&
from_cs != &my_charset_bin &&
cast_cs != &my_charset_bin);
collation.set(cast_cs, DERIVATION_IMPLICIT);
collation= DTCollation::string_typecast(cast_cs);
char_length= ((cast_length != ~0U) ? cast_length :
args[0]->max_length /
(cast_cs == &my_charset_bin ? 1 :

50
sql/sql_type.h
View File

@ -3019,13 +3019,46 @@ static inline my_repertoire_t &operator|=(my_repertoire_t &a,
enum Derivation
{
DERIVATION_IGNORABLE= 6,
DERIVATION_NUMERIC= 5,
DERIVATION_COERCIBLE= 4,
DERIVATION_IGNORABLE= 7, // Explicit NULL
/*
Explicit or implicit conversion from numeric/temporal data to string:
- Numbers/temporals in string context
- Numeric user variables
- CAST(numeric_or_temporal_expr AS CHAR)
*/
DERIVATION_NUMERIC= 6,
/*
- String literals
- String user variables
*/
DERIVATION_COERCIBLE= 5,
/*
String cast and conversion functions:
- BINARY(expr)
- CAST(string_expr AS CHAR)
- CONVERT(expr USING cs)
*/
DERIVATION_CAST= 4,
/*
utf8 metadata functions:
- DATABASE()
- CURRENT_ROLE()
- USER()
*/
DERIVATION_SYSCONST= 3,
/*
- Table columns
- SP variables
- BINARY(expr) and CAST(expr AS BINARY)
*/
DERIVATION_IMPLICIT= 2,
DERIVATION_NONE= 1,
DERIVATION_EXPLICIT= 0
DERIVATION_NONE= 1, // A mix (e.g. CONCAT) of two differrent collations
DERIVATION_EXPLICIT= 0 // An explicit COLLATE clause
};
@ -3079,6 +3112,12 @@ public:
derivation(derivation_arg),
repertoire(repertoire_arg)
{ }
static DTCollation string_typecast(CHARSET_INFO *collation_arg)
{
return DTCollation(collation_arg,
collation_arg == &my_charset_bin ?
DERIVATION_IMPLICIT : DERIVATION_CAST);
}
void set(const DTCollation &dt)
{
*this= dt;
@ -3114,6 +3153,7 @@ public:
case DERIVATION_NUMERIC: return "NUMERIC";
case DERIVATION_IGNORABLE: return "IGNORABLE";
case DERIVATION_COERCIBLE: return "COERCIBLE";
case DERIVATION_CAST: return "CAST";
case DERIVATION_IMPLICIT: return "IMPLICIT";
case DERIVATION_SYSCONST: return "SYSCONST";
case DERIVATION_EXPLICIT: return "EXPLICIT";