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.

mysql-test/main/information_schema.result

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

mysql-test/main/information_schema_all_engines.result

@@ -4,6 +4,7 @@ Tables_in_information_schema
 ALL_PLUGINS
 APPLICABLE_ROLES
 CHARACTER_SETS
+CHECK_CONSTRAINTS
 CLIENT_STATISTICS
 COLLATIONS
 COLLATION_CHARACTER_SET_APPLICABILITY
@@ -83,6 +84,7 @@ table_name	column_name
 ALL_PLUGINS	PLUGIN_NAME
 APPLICABLE_ROLES	GRANTEE
 CHARACTER_SETS	CHARACTER_SET_NAME
+CHECK_CONSTRAINTS	CONSTRAINT_SCHEMA
 CLIENT_STATISTICS	CLIENT
 COLLATIONS	COLLATION_NAME
 COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
@@ -162,6 +164,7 @@ table_name	column_name
 ALL_PLUGINS	PLUGIN_NAME
 APPLICABLE_ROLES	GRANTEE
 CHARACTER_SETS	CHARACTER_SET_NAME
+CHECK_CONSTRAINTS	CONSTRAINT_SCHEMA
 CLIENT_STATISTICS	CLIENT
 COLLATIONS	COLLATION_NAME
 COLLATION_CHARACTER_SET_APPLICABILITY	COLLATION_NAME
@@ -247,6 +250,7 @@ table_name	group_concat(t.table_schema, '.', t.table_name)	num1
 ALL_PLUGINS	information_schema.ALL_PLUGINS	1
 APPLICABLE_ROLES	information_schema.APPLICABLE_ROLES	1
 CHARACTER_SETS	information_schema.CHARACTER_SETS	1
+CHECK_CONSTRAINTS	information_schema.CHECK_CONSTRAINTS	1
 CLIENT_STATISTICS	information_schema.CLIENT_STATISTICS	1
 COLLATIONS	information_schema.COLLATIONS	1
 COLLATION_CHARACTER_SET_APPLICABILITY	information_schema.COLLATION_CHARACTER_SET_APPLICABILITY	1
@@ -315,6 +319,7 @@ Database: information_schema
 | ALL_PLUGINS                           |
 | APPLICABLE_ROLES                      |
 | CHARACTER_SETS                        |
+| CHECK_CONSTRAINTS                     |
 | CLIENT_STATISTICS                     |
 | COLLATIONS                            |
 | COLLATION_CHARACTER_SET_APPLICABILITY |
@@ -384,6 +389,7 @@ Database: INFORMATION_SCHEMA
 | ALL_PLUGINS                           |
 | APPLICABLE_ROLES                      |
 | CHARACTER_SETS                        |
+| CHECK_CONSTRAINTS                     |
 | CLIENT_STATISTICS                     |
 | COLLATIONS                            |
 | COLLATION_CHARACTER_SET_APPLICABILITY |
@@ -453,5 +459,5 @@ Wildcard: inf_rmation_schema
 | information_schema |
 SELECT table_schema, count(*) FROM information_schema.TABLES WHERE table_schema IN ('mysql', 'INFORMATION_SCHEMA', 'test', 'mysqltest') GROUP BY TABLE_SCHEMA;
 table_schema	count(*)
-information_schema	64
+information_schema	65
 mysql	31

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

@@ -0,0 +1,144 @@
+#
+# MDEV-14474: Create INFORMATION_SCHEMA.CHECK_CONSTRAINTS
+#
+set check_constraint_checks=1;
+use test;
+create table t0
+(
+t int, check (t>32) # table constraint
+) ENGINE=myisam;
+SELECT * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CONSTRAINT_1
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` > 32
+ALTER TABLE t0
+ADD CONSTRAINT CHK_t0_t CHECK(t<100);
+SELECT * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CONSTRAINT_1
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` > 32
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CHK_t0_t
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` < 100
+ALTER TABLE t0
+DROP CONSTRAINT CHK_t0_t;
+SELECT * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CONSTRAINT_1
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` > 32
+CREATE TABLE t1
+( t int CHECK(t>2), # field constraint
+tt int, CONSTRAINT CHK_tt CHECK(tt<100) # table constraint
+) ENGINE=InnoDB;
+SELECT * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	t
+TABLE_NAME	t1
+CHECK_CLAUSE	`t` > 2
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CHK_tt
+TABLE_NAME	t1
+CHECK_CLAUSE	`tt` < 100
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CONSTRAINT_1
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` > 32
+ALTER TABLE t1
+DROP CONSTRAINT CHK_tt;
+SELECT * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	t
+TABLE_NAME	t1
+CHECK_CLAUSE	`t` > 2
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CONSTRAINT_1
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` > 32
+create table t2
+(
+name VARCHAR(30) CHECK(CHAR_LENGTH(name)>2), #field constraint
+start_date DATE,
+end_date DATE,
+CONSTRAINT CHK_dates CHECK(start_date IS NULL) #table constraint
+)ENGINE=Innodb;
+SELECT * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	name
+TABLE_NAME	t2
+CHECK_CLAUSE	char_length(`name`) > 2
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CHK_dates
+TABLE_NAME	t2
+CHECK_CLAUSE	`start_date` is null
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	t
+TABLE_NAME	t1
+CHECK_CLAUSE	`t` > 2
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CONSTRAINT_1
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` > 32
+ALTER TABLE t1
+ADD CONSTRAINT CHK_new_ CHECK(t>tt);
+SELECT * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	name
+TABLE_NAME	t2
+CHECK_CLAUSE	char_length(`name`) > 2
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CHK_dates
+TABLE_NAME	t2
+CHECK_CLAUSE	`start_date` is null
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	t
+TABLE_NAME	t1
+CHECK_CLAUSE	`t` > 2
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CHK_new_
+TABLE_NAME	t1
+CHECK_CLAUSE	`t` > `tt`
+CONSTRAINT_CATALOG	def
+CONSTRAINT_SCHEMA	test
+CONSTRAINT_NAME	CONSTRAINT_1
+TABLE_NAME	t0
+CHECK_CLAUSE	`t` > 32
+create table t3
+(
+a int,
+b int check (b>0), # field constraint named 'b'
+CONSTRAINT b check (b>10) # table constraint
+) ENGINE=InnoDB;
+select * from information_schema.check_constraints;
+CONSTRAINT_CATALOG	CONSTRAINT_SCHEMA	CONSTRAINT_NAME	TABLE_NAME	CHECK_CLAUSE
+def	test	b	t3	`b` > 0
+def	test	b	t3	`b` > 10
+def	test	name	t2	char_length(`name`) > 2
+def	test	CHK_dates	t2	`start_date` is null
+def	test	t	t1	`t` > 2
+def	test	CHK_new_	t1	`t` > `tt`
+def	test	CONSTRAINT_1	t0	`t` > 32
+drop table t0;
+drop table t1;
+drop table t2;
+drop table t3;

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

@@ -24,6 +24,11 @@ def	information_schema	CHARACTER_SETS	CHARACTER_SET_NAME	1	''	NO	varchar	32	96	N
 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
 def	information_schema	CHARACTER_SETS	DESCRIPTION	3	''	NO	varchar	60	180	NULL	NULL	NULL	utf8	utf8_general_ci	varchar(60)			select		NEVER	NULL
 def	information_schema	CHARACTER_SETS	MAXLEN	4	0	NO	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(3)			select		NEVER	NULL
+def	information_schema	CHECK_CONSTRAINTS	CHECK_CLAUSE	5	''	NO	varchar	64	192	NULL	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select		NEVER	NULL
+def	information_schema	CHECK_CONSTRAINTS	CONSTRAINT_CATALOG	1	''	NO	varchar	512	1536	NULL	NULL	NULL	utf8	utf8_general_ci	varchar(512)			select		NEVER	NULL
+def	information_schema	CHECK_CONSTRAINTS	CONSTRAINT_NAME	3	''	NO	varchar	64	192	NULL	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select		NEVER	NULL
+def	information_schema	CHECK_CONSTRAINTS	CONSTRAINT_SCHEMA	2	''	NO	varchar	64	192	NULL	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select		NEVER	NULL
+def	information_schema	CHECK_CONSTRAINTS	TABLE_NAME	4	''	NO	varchar	64	192	NULL	NULL	NULL	utf8	utf8_general_ci	varchar(64)			select		NEVER	NULL
 def	information_schema	CLIENT_STATISTICS	ACCESS_DENIED	22	0	NO	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(21)			select		NEVER	NULL
 def	information_schema	CLIENT_STATISTICS	BINLOG_BYTES_WRITTEN	9	0	NO	bigint	NULL	NULL	19	0	NULL	NULL	NULL	bigint(21)			select		NEVER	NULL
 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
 3.0000	information_schema	CHARACTER_SETS	DEFAULT_COLLATE_NAME	varchar	32	96	utf8	utf8_general_ci	varchar(32)
 3.0000	information_schema	CHARACTER_SETS	DESCRIPTION	varchar	60	180	utf8	utf8_general_ci	varchar(60)
 NULL	information_schema	CHARACTER_SETS	MAXLEN	bigint	NULL	NULL	NULL	NULL	bigint(3)
+3.0000	information_schema	CHECK_CONSTRAINTS	CONSTRAINT_CATALOG	varchar	512	1536	utf8	utf8_general_ci	varchar(512)
+3.0000	information_schema	CHECK_CONSTRAINTS	CONSTRAINT_SCHEMA	varchar	64	192	utf8	utf8_general_ci	varchar(64)
+3.0000	information_schema	CHECK_CONSTRAINTS	CONSTRAINT_NAME	varchar	64	192	utf8	utf8_general_ci	varchar(64)
+3.0000	information_schema	CHECK_CONSTRAINTS	TABLE_NAME	varchar	64	192	utf8	utf8_general_ci	varchar(64)
+3.0000	information_schema	CHECK_CONSTRAINTS	CHECK_CLAUSE	varchar	64	192	utf8	utf8_general_ci	varchar(64)
 3.0000	information_schema	CLIENT_STATISTICS	CLIENT	varchar	64	192	utf8	utf8_general_ci	varchar(64)
 NULL	information_schema	CLIENT_STATISTICS	TOTAL_CONNECTIONS	bigint	NULL	NULL	NULL	NULL	bigint(21)
 NULL	information_schema	CLIENT_STATISTICS	CONCURRENT_CONNECTIONS	bigint	NULL	NULL	NULL	NULL	bigint(21)

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

@@ -89,6 +89,31 @@ user_comment
 Separator	-----------------------------------------------------
 TABLE_CATALOG	def
 TABLE_SCHEMA	information_schema
+TABLE_NAME	CHECK_CONSTRAINTS
+TABLE_TYPE	SYSTEM VIEW
+ENGINE	MEMORY
+VERSION	11
+ROW_FORMAT	Fixed
+TABLE_ROWS	#TBLR#
+AVG_ROW_LENGTH	#ARL#
+DATA_LENGTH	#DL#
+MAX_DATA_LENGTH	#MDL#
+INDEX_LENGTH	#IL#
+DATA_FREE	#DF#
+AUTO_INCREMENT	NULL
+CREATE_TIME	#CRT#
+UPDATE_TIME	#UT#
+CHECK_TIME	#CT#
+TABLE_COLLATION	utf8_general_ci
+CHECKSUM	NULL
+CREATE_OPTIONS	#CO#
+TABLE_COMMENT	#TC#
+MAX_INDEX_LENGTH	#MIL#
+TEMPORARY	Y
+user_comment	
+Separator	-----------------------------------------------------
+TABLE_CATALOG	def
+TABLE_SCHEMA	information_schema
 TABLE_NAME	CLIENT_STATISTICS
 TABLE_TYPE	SYSTEM VIEW
 ENGINE	MEMORY
@@ -1105,6 +1130,31 @@ user_comment
 Separator	-----------------------------------------------------
 TABLE_CATALOG	def
 TABLE_SCHEMA	information_schema
+TABLE_NAME	CHECK_CONSTRAINTS
+TABLE_TYPE	SYSTEM VIEW
+ENGINE	MEMORY
+VERSION	11
+ROW_FORMAT	Fixed
+TABLE_ROWS	#TBLR#
+AVG_ROW_LENGTH	#ARL#
+DATA_LENGTH	#DL#
+MAX_DATA_LENGTH	#MDL#
+INDEX_LENGTH	#IL#
+DATA_FREE	#DF#
+AUTO_INCREMENT	NULL
+CREATE_TIME	#CRT#
+UPDATE_TIME	#UT#
+CHECK_TIME	#CT#
+TABLE_COLLATION	utf8_general_ci
+CHECKSUM	NULL
+CREATE_OPTIONS	#CO#
+TABLE_COMMENT	#TC#
+MAX_INDEX_LENGTH	#MIL#
+TEMPORARY	Y
+user_comment	
+Separator	-----------------------------------------------------
+TABLE_CATALOG	def
+TABLE_SCHEMA	information_schema
 TABLE_NAME	CLIENT_STATISTICS
 TABLE_TYPE	SYSTEM VIEW
 ENGINE	MEMORY

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

@@ -0,0 +1,69 @@
+--source include/have_innodb.inc
+--echo #
+--echo # MDEV-14474: Create INFORMATION_SCHEMA.CHECK_CONSTRAINTS
+--echo #
+
+set check_constraint_checks=1;
+
+use test;
+create table t0
+(
+ t int, check (t>32) # table constraint
+) ENGINE=myisam;
+
+--vertical_results
+SELECT * from information_schema.check_constraints;
+
+ALTER TABLE t0
+ADD CONSTRAINT CHK_t0_t CHECK(t<100);
+
+SELECT * from information_schema.check_constraints;
+
+ALTER TABLE t0
+DROP CONSTRAINT CHK_t0_t;
+
+SELECT * from information_schema.check_constraints;
+
+CREATE TABLE t1
+( t int CHECK(t>2), # field constraint
+ tt int, CONSTRAINT CHK_tt CHECK(tt<100) # table constraint
+) ENGINE=InnoDB;
+
+SELECT * from information_schema.check_constraints;
+
+ALTER TABLE t1
+DROP CONSTRAINT CHK_tt;
+
+SELECT * from information_schema.check_constraints;
+
+create table t2
+(
+name VARCHAR(30) CHECK(CHAR_LENGTH(name)>2), #field constraint
+start_date DATE,
+end_date DATE,
+CONSTRAINT CHK_dates CHECK(start_date IS NULL) #table constraint
+)ENGINE=Innodb;
+
+SELECT * from information_schema.check_constraints;
+
+ALTER TABLE t1
+ADD CONSTRAINT CHK_new_ CHECK(t>tt);
+
+SELECT * from information_schema.check_constraints;
+
+
+# Create table with same field and table check constraint name
+create table t3
+(
+a int,
+b int check (b>0), # field constraint named 'b'
+CONSTRAINT b check (b>10) # table constraint
+) ENGINE=InnoDB;
+
+--horizontal_results
+select * from information_schema.check_constraints;
+
+drop table t0;
+drop table t1;
+drop table t2;
+drop table t3;

sql/handler.h

@@ -950,6 +950,7 @@ enum enum_schema_tables
   SCH_ALL_PLUGINS,
   SCH_APPLICABLE_ROLES,
   SCH_CHARSETS,
+  SCH_CHECK_CONSTRAINTS,
   SCH_COLLATIONS,
   SCH_COLLATION_CHARACTER_SET_APPLICABILITY,
   SCH_COLUMNS,

sql/sql_parse.cc

@@ -2565,6 +2565,7 @@ int prepare_schema_table(THD *thd, LEX *lex, Table_ident *table_ident,
 
   case SCH_TABLE_NAMES:
   case SCH_TABLES:
+  case SCH_CHECK_CONSTRAINTS:
   case SCH_VIEWS:
   case SCH_TRIGGERS:
   case SCH_EVENTS: