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MDEV-14474 information_schema.check_constraints
Implement according to standard SQL specification 2008. The check_constraints table is used for fetching metadata about the constraints defined for tables in all databases.
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‎mysql-test/main/information_schema.result‎

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Original file line numberDiff line numberDiff line change
@@ -51,6 +51,7 @@ c
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ALL_PLUGINS
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APPLICABLE_ROLES
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CHARACTER_SETS
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CHECK_CONSTRAINTS
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CLIENT_STATISTICS
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COLLATIONS
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COLLATION_CHARACTER_SET_APPLICABILITY
@@ -938,6 +939,7 @@ connection user10261;
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SELECT TABLE_NAME, COLUMN_NAME, PRIVILEGES FROM INFORMATION_SCHEMA.COLUMNS
939940
where COLUMN_NAME='TABLE_NAME' and table_name not like 'innodb%';
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TABLE_NAME COLUMN_NAME PRIVILEGES
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CHECK_CONSTRAINTS TABLE_NAME select
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COLUMNS TABLE_NAME select
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COLUMN_PRIVILEGES TABLE_NAME select
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FILES TABLE_NAME select

‎mysql-test/main/information_schema_all_engines.result‎

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Original file line numberDiff line numberDiff line change
@@ -4,6 +4,7 @@ Tables_in_information_schema
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ALL_PLUGINS
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APPLICABLE_ROLES
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CHARACTER_SETS
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CHECK_CONSTRAINTS
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CLIENT_STATISTICS
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COLLATIONS
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COLLATION_CHARACTER_SET_APPLICABILITY
@@ -83,6 +84,7 @@ table_name column_name
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ALL_PLUGINS PLUGIN_NAME
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APPLICABLE_ROLES GRANTEE
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CHARACTER_SETS CHARACTER_SET_NAME
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CHECK_CONSTRAINTS CONSTRAINT_SCHEMA
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CLIENT_STATISTICS CLIENT
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COLLATIONS COLLATION_NAME
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COLLATION_CHARACTER_SET_APPLICABILITY COLLATION_NAME
@@ -162,6 +164,7 @@ table_name column_name
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ALL_PLUGINS PLUGIN_NAME
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APPLICABLE_ROLES GRANTEE
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CHARACTER_SETS CHARACTER_SET_NAME
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CHECK_CONSTRAINTS CONSTRAINT_SCHEMA
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CLIENT_STATISTICS CLIENT
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COLLATIONS COLLATION_NAME
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COLLATION_CHARACTER_SET_APPLICABILITY COLLATION_NAME
@@ -247,6 +250,7 @@ table_name group_concat(t.table_schema, '.', t.table_name) num1
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ALL_PLUGINS information_schema.ALL_PLUGINS 1
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APPLICABLE_ROLES information_schema.APPLICABLE_ROLES 1
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CHARACTER_SETS information_schema.CHARACTER_SETS 1
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CHECK_CONSTRAINTS information_schema.CHECK_CONSTRAINTS 1
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CLIENT_STATISTICS information_schema.CLIENT_STATISTICS 1
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COLLATIONS information_schema.COLLATIONS 1
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COLLATION_CHARACTER_SET_APPLICABILITY information_schema.COLLATION_CHARACTER_SET_APPLICABILITY 1
@@ -315,6 +319,7 @@ Database: information_schema
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| ALL_PLUGINS |
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| APPLICABLE_ROLES |
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| CHARACTER_SETS |
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| CHECK_CONSTRAINTS |
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| CLIENT_STATISTICS |
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| COLLATIONS |
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| COLLATION_CHARACTER_SET_APPLICABILITY |
@@ -384,6 +389,7 @@ Database: INFORMATION_SCHEMA
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| ALL_PLUGINS |
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| APPLICABLE_ROLES |
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| CHARACTER_SETS |
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| CHECK_CONSTRAINTS |
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| CLIENT_STATISTICS |
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| COLLATIONS |
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| COLLATION_CHARACTER_SET_APPLICABILITY |
@@ -453,5 +459,5 @@ Wildcard: inf_rmation_schema
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| information_schema |
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SELECT table_schema, count(*) FROM information_schema.TABLES WHERE table_schema IN ('mysql', 'INFORMATION_SCHEMA', 'test', 'mysqltest') GROUP BY TABLE_SCHEMA;
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table_schema count(*)
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information_schema64
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information_schema65
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mysql 31

‎mysql-test/suite/funcs_1/r/is_check_constraints.result‎

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@@ -0,0 +1,144 @@
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#
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# MDEV-14474: Create INFORMATION_SCHEMA.CHECK_CONSTRAINTS
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#
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set check_constraint_checks=1;
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use test;
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create table t0
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(
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t int, check (t>32) # table constraint
9+
) ENGINE=myisam;
10+
SELECT * from information_schema.check_constraints;
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CONSTRAINT_1
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TABLE_NAME t0
15+
CHECK_CLAUSE `t` > 32
16+
ALTER TABLE t0
17+
ADD CONSTRAINT CHK_t0_t CHECK(t<100);
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SELECT * from information_schema.check_constraints;
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CONSTRAINT_1
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TABLE_NAME t0
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CHECK_CLAUSE `t` > 32
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CHK_t0_t
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TABLE_NAME t0
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CHECK_CLAUSE `t` < 100
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ALTER TABLE t0
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DROP CONSTRAINT CHK_t0_t;
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SELECT * from information_schema.check_constraints;
32+
CONSTRAINT_CATALOG def
33+
CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CONSTRAINT_1
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TABLE_NAME t0
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CHECK_CLAUSE `t` > 32
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CREATE TABLE t1
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( t int CHECK(t>2), # field constraint
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tt int, CONSTRAINT CHK_tt CHECK(tt<100) # table constraint
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) ENGINE=InnoDB;
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SELECT * from information_schema.check_constraints;
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME t
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TABLE_NAME t1
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CHECK_CLAUSE `t` > 2
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CHK_tt
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TABLE_NAME t1
51+
CHECK_CLAUSE `tt` < 100
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CONSTRAINT_CATALOG def
53+
CONSTRAINT_SCHEMA test
54+
CONSTRAINT_NAME CONSTRAINT_1
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TABLE_NAME t0
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CHECK_CLAUSE `t` > 32
57+
ALTER TABLE t1
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DROP CONSTRAINT CHK_tt;
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SELECT * from information_schema.check_constraints;
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CONSTRAINT_CATALOG def
61+
CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME t
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TABLE_NAME t1
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CHECK_CLAUSE `t` > 2
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CONSTRAINT_1
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TABLE_NAME t0
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CHECK_CLAUSE `t` > 32
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create table t2
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(
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name VARCHAR(30) CHECK(CHAR_LENGTH(name)>2), #field constraint
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start_date DATE,
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end_date DATE,
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CONSTRAINT CHK_dates CHECK(start_date IS NULL) #table constraint
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)ENGINE=Innodb;
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SELECT * from information_schema.check_constraints;
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME name
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TABLE_NAME t2
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CHECK_CLAUSE char_length(`name`) > 2
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CHK_dates
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TABLE_NAME t2
87+
CHECK_CLAUSE `start_date` is null
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME t
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TABLE_NAME t1
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CHECK_CLAUSE `t` > 2
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CONSTRAINT_1
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TABLE_NAME t0
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CHECK_CLAUSE `t` > 32
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ALTER TABLE t1
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ADD CONSTRAINT CHK_new_ CHECK(t>tt);
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SELECT * from information_schema.check_constraints;
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
103+
CONSTRAINT_NAME name
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TABLE_NAME t2
105+
CHECK_CLAUSE char_length(`name`) > 2
106+
CONSTRAINT_CATALOG def
107+
CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CHK_dates
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TABLE_NAME t2
110+
CHECK_CLAUSE `start_date` is null
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CONSTRAINT_CATALOG def
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CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME t
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TABLE_NAME t1
115+
CHECK_CLAUSE `t` > 2
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CONSTRAINT_CATALOG def
117+
CONSTRAINT_SCHEMA test
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CONSTRAINT_NAME CHK_new_
119+
TABLE_NAME t1
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CHECK_CLAUSE `t` > `tt`
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CONSTRAINT_CATALOG def
122+
CONSTRAINT_SCHEMA test
123+
CONSTRAINT_NAME CONSTRAINT_1
124+
TABLE_NAME t0
125+
CHECK_CLAUSE `t` > 32
126+
create table t3
127+
(
128+
a int,
129+
b int check (b>0), # field constraint named 'b'
130+
CONSTRAINT b check (b>10) # table constraint
131+
) ENGINE=InnoDB;
132+
select * from information_schema.check_constraints;
133+
CONSTRAINT_CATALOG CONSTRAINT_SCHEMA CONSTRAINT_NAME TABLE_NAME CHECK_CLAUSE
134+
def test b t3 `b` > 0
135+
def test b t3 `b` > 10
136+
def test name t2 char_length(`name`) > 2
137+
def test CHK_dates t2 `start_date` is null
138+
def test t t1 `t` > 2
139+
def test CHK_new_ t1 `t` > `tt`
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def test CONSTRAINT_1 t0 `t` > 32
141+
drop table t0;
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drop table t1;
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drop table t2;
144+
drop table t3;

‎mysql-test/suite/funcs_1/r/is_columns_is.result‎

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@@ -24,6 +24,11 @@ def information_schema CHARACTER_SETS CHARACTER_SET_NAME 1 '' NO varchar 32 96 N
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def information_schema CHARACTER_SETS DEFAULT_COLLATE_NAME 2 '' NO varchar 32 96 NULL NULL NULL utf8 utf8_general_ci varchar(32) select NEVER NULL
2525
def information_schema CHARACTER_SETS DESCRIPTION 3 '' NO varchar 60 180 NULL NULL NULL utf8 utf8_general_ci varchar(60) select NEVER NULL
2626
def information_schema CHARACTER_SETS MAXLEN 4 0 NO bigint NULL NULL 19 0 NULL NULL NULL bigint(3) select NEVER NULL
27+
def information_schema CHECK_CONSTRAINTS CHECK_CLAUSE 5 '' NO varchar 64 192 NULL NULL NULL utf8 utf8_general_ci varchar(64) select NEVER NULL
28+
def information_schema CHECK_CONSTRAINTS CONSTRAINT_CATALOG 1 '' NO varchar 512 1536 NULL NULL NULL utf8 utf8_general_ci varchar(512) select NEVER NULL
29+
def information_schema CHECK_CONSTRAINTS CONSTRAINT_NAME 3 '' NO varchar 64 192 NULL NULL NULL utf8 utf8_general_ci varchar(64) select NEVER NULL
30+
def information_schema CHECK_CONSTRAINTS CONSTRAINT_SCHEMA 2 '' NO varchar 64 192 NULL NULL NULL utf8 utf8_general_ci varchar(64) select NEVER NULL
31+
def information_schema CHECK_CONSTRAINTS TABLE_NAME 4 '' NO varchar 64 192 NULL NULL NULL utf8 utf8_general_ci varchar(64) select NEVER NULL
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def information_schema CLIENT_STATISTICS ACCESS_DENIED 22 0 NO bigint NULL NULL 19 0 NULL NULL NULL bigint(21) select NEVER NULL
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def information_schema CLIENT_STATISTICS BINLOG_BYTES_WRITTEN 9 0 NO bigint NULL NULL 19 0 NULL NULL NULL bigint(21) select NEVER NULL
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def information_schema CLIENT_STATISTICS BUSY_TIME 5 0 NO double NULL NULL 21 NULL NULL NULL NULL double select NEVER NULL
@@ -557,6 +562,11 @@ COL_CML TABLE_SCHEMA TABLE_NAME COLUMN_NAME DATA_TYPE CHARACTER_MAXIMUM_LENGTH C
557562
3.0000 information_schema CHARACTER_SETS DEFAULT_COLLATE_NAME varchar 32 96 utf8 utf8_general_ci varchar(32)
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3.0000 information_schema CHARACTER_SETS DESCRIPTION varchar 60 180 utf8 utf8_general_ci varchar(60)
559564
NULL information_schema CHARACTER_SETS MAXLEN bigint NULL NULL NULL NULL bigint(3)
565+
3.0000 information_schema CHECK_CONSTRAINTS CONSTRAINT_CATALOG varchar 512 1536 utf8 utf8_general_ci varchar(512)
566+
3.0000 information_schema CHECK_CONSTRAINTS CONSTRAINT_SCHEMA varchar 64 192 utf8 utf8_general_ci varchar(64)
567+
3.0000 information_schema CHECK_CONSTRAINTS CONSTRAINT_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)
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3.0000 information_schema CHECK_CONSTRAINTS TABLE_NAME varchar 64 192 utf8 utf8_general_ci varchar(64)
569+
3.0000 information_schema CHECK_CONSTRAINTS CHECK_CLAUSE varchar 64 192 utf8 utf8_general_ci varchar(64)
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3.0000 information_schema CLIENT_STATISTICS CLIENT varchar 64 192 utf8 utf8_general_ci varchar(64)
561571
NULL information_schema CLIENT_STATISTICS TOTAL_CONNECTIONS bigint NULL NULL NULL NULL bigint(21)
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NULL information_schema CLIENT_STATISTICS CONCURRENT_CONNECTIONS bigint NULL NULL NULL NULL bigint(21)

‎mysql-test/suite/funcs_1/r/is_tables_is.result‎

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@@ -89,6 +89,31 @@ user_comment
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Separator -----------------------------------------------------
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TABLE_CATALOG def
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TABLE_SCHEMA information_schema
92+
TABLE_NAME CHECK_CONSTRAINTS
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TABLE_TYPE SYSTEM VIEW
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ENGINE MEMORY
95+
VERSION 11
96+
ROW_FORMAT Fixed
97+
TABLE_ROWS #TBLR#
98+
AVG_ROW_LENGTH #ARL#
99+
DATA_LENGTH #DL#
100+
MAX_DATA_LENGTH #MDL#
101+
INDEX_LENGTH #IL#
102+
DATA_FREE #DF#
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AUTO_INCREMENT NULL
104+
CREATE_TIME #CRT#
105+
UPDATE_TIME #UT#
106+
CHECK_TIME #CT#
107+
TABLE_COLLATION utf8_general_ci
108+
CHECKSUM NULL
109+
CREATE_OPTIONS #CO#
110+
TABLE_COMMENT #TC#
111+
MAX_INDEX_LENGTH #MIL#
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TEMPORARY Y
113+
user_comment
114+
Separator -----------------------------------------------------
115+
TABLE_CATALOG def
116+
TABLE_SCHEMA information_schema
92117
TABLE_NAME CLIENT_STATISTICS
93118
TABLE_TYPE SYSTEM VIEW
94119
ENGINE MEMORY
@@ -1105,6 +1130,31 @@ user_comment
11051130
Separator -----------------------------------------------------
11061131
TABLE_CATALOG def
11071132
TABLE_SCHEMA information_schema
1133+
TABLE_NAME CHECK_CONSTRAINTS
1134+
TABLE_TYPE SYSTEM VIEW
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ENGINE MEMORY
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VERSION 11
1137+
ROW_FORMAT Fixed
1138+
TABLE_ROWS #TBLR#
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AVG_ROW_LENGTH #ARL#
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DATA_LENGTH #DL#
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MAX_DATA_LENGTH #MDL#
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INDEX_LENGTH #IL#
1143+
DATA_FREE #DF#
1144+
AUTO_INCREMENT NULL
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CREATE_TIME #CRT#
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UPDATE_TIME #UT#
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CHECK_TIME #CT#
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TABLE_COLLATION utf8_general_ci
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CHECKSUM NULL
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CREATE_OPTIONS #CO#
1151+
TABLE_COMMENT #TC#
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MAX_INDEX_LENGTH #MIL#
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TEMPORARY Y
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user_comment
1155+
Separator -----------------------------------------------------
1156+
TABLE_CATALOG def
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TABLE_SCHEMA information_schema
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TABLE_NAME CLIENT_STATISTICS
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TABLE_TYPE SYSTEM VIEW
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ENGINE MEMORY

‎mysql-test/suite/funcs_1/t/is_check_constraints.test‎

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--source include/have_innodb.inc
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--echo #
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--echo # MDEV-14474: Create INFORMATION_SCHEMA.CHECK_CONSTRAINTS
4+
--echo #
5+
6+
set check_constraint_checks=1;
7+
8+
use test;
9+
create table t0
10+
(
11+
t int, check (t>32) # table constraint
12+
) ENGINE=myisam;
13+
14+
--vertical_results
15+
SELECT * from information_schema.check_constraints;
16+
17+
ALTER TABLE t0
18+
ADD CONSTRAINT CHK_t0_t CHECK(t<100);
19+
20+
SELECT * from information_schema.check_constraints;
21+
22+
ALTER TABLE t0
23+
DROP CONSTRAINT CHK_t0_t;
24+
25+
SELECT * from information_schema.check_constraints;
26+
27+
CREATE TABLE t1
28+
( t int CHECK(t>2), # field constraint
29+
tt int, CONSTRAINT CHK_tt CHECK(tt<100) # table constraint
30+
) ENGINE=InnoDB;
31+
32+
SELECT * from information_schema.check_constraints;
33+
34+
ALTER TABLE t1
35+
DROP CONSTRAINT CHK_tt;
36+
37+
SELECT * from information_schema.check_constraints;
38+
39+
create table t2
40+
(
41+
name VARCHAR(30) CHECK(CHAR_LENGTH(name)>2), #field constraint
42+
start_date DATE,
43+
end_date DATE,
44+
CONSTRAINT CHK_dates CHECK(start_date IS NULL) #table constraint
45+
)ENGINE=Innodb;
46+
47+
SELECT * from information_schema.check_constraints;
48+
49+
ALTER TABLE t1
50+
ADD CONSTRAINT CHK_new_ CHECK(t>tt);
51+
52+
SELECT * from information_schema.check_constraints;
53+
54+
55+
# Create table with same field and table check constraint name
56+
create table t3
57+
(
58+
a int,
59+
b int check (b>0), # field constraint named 'b'
60+
CONSTRAINT b check (b>10) # table constraint
61+
) ENGINE=InnoDB;
62+
63+
--horizontal_results
64+
select * from information_schema.check_constraints;
65+
66+
drop table t0;
67+
drop table t1;
68+
drop table t2;
69+
drop table t3;

‎sql/handler.h‎

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Original file line numberDiff line numberDiff line change
@@ -950,6 +950,7 @@ enum enum_schema_tables
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SCH_ALL_PLUGINS,
951951
SCH_APPLICABLE_ROLES,
952952
SCH_CHARSETS,
953+
SCH_CHECK_CONSTRAINTS,
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SCH_COLLATIONS,
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SCH_COLLATION_CHARACTER_SET_APPLICABILITY,
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SCH_COLUMNS,

‎sql/sql_parse.cc‎

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Original file line numberDiff line numberDiff line change
@@ -2565,6 +2565,7 @@ int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
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case SCH_TABLE_NAMES:
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case SCH_TABLES:
2568+
case SCH_CHECK_CONSTRAINTS:
25682569
case SCH_VIEWS:
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case SCH_TRIGGERS:
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case SCH_EVENTS:

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