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Fixed many problems in the code of With_element::check_unrestricted_recursive().

Browse Source 
Added the check whether there are set functions in the specifications of recursive CTE.
Added the check whether there are recursive references in subqueries.
Introduced boolean system variable 'standards_compliant_cte'. By default it's set to 'on'.
When it's set to 'off' non-standard compliant CTE can be executed.
This commit is contained in:
Galina Shalygina
2016-05-19 22:07:53 +03:00
parent 3b47632bfc
commit 46a2e41398
13 changed files with 675 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

347
mysql-test/r/cte_recursive.result
View File

@ -30,7 +30,8 @@ insert into folks values
(9, 'Grandma Ann', '1941-10-15', null, null),
(25, 'Uncle Jim', '1968-11-18', 8, 7),
(98, 'Sister Amy', '2001-06-20', 20, 30),
(8, 'Grandma Sally', '1943-08-23', 5, 6),
(7, 'Grandma Sally', '1943-08-23', null, 6),
(8, 'Grandpa Ben', '1940-10-21', null, null),
(6, 'Grandgrandma Martha', '1923-05-17', null, null),
(67, 'Cousin Eddie', '1992-02-28', 25, 27),
(27, 'Auntie Melinda', '1971-03-29', null, null);
@ -53,7 +54,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
8 Grandpa Ben 1940-10-21 NULL NULL
6 Grandgrandma Martha 1923-05-17 NULL NULL
with recursive
ancestors
@ -74,7 +76,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
8 Grandpa Ben 1940-10-21 NULL NULL
6 Grandgrandma Martha 1923-05-17 NULL NULL
with recursive
ancestors
@ -93,7 +96,8 @@ id name dob father mother
67 Cousin Eddie 1992-02-28 25 27
25 Uncle Jim 1968-11-18 8 7
27 Auntie Melinda 1971-03-29 NULL NULL
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
8 Grandpa Ben 1940-10-21 NULL NULL
6 Grandgrandma Martha 1923-05-17 NULL NULL
with recursive
ancestors
@ -115,7 +119,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
8 Grandpa Ben 1940-10-21 NULL NULL
6 Grandgrandma Martha 1923-05-17 NULL NULL
with recursive
prev_gen
@ -150,6 +155,7 @@ Mom 1975-03-03
Grandpa Bill 1940-04-05
Grandma Ann 1941-10-15
Grandma Sally 1943-08-23
Grandpa Ben 1940-10-21
Grandgrandma Martha 1923-05-17
with recursive
descendants
@ -183,7 +189,7 @@ where d.id=folks.father or d.id=folks.mother
)
select * from descendants;
id name dob father mother
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
30 Mom 1975-03-03 8 7
25 Uncle Jim 1968-11-18 8 7
100 Vasya 2000-01-01 20 30
@ -208,6 +214,7 @@ where a.father=t1.id AND a.mother=t2.id);
id name dob father mother id name dob father mother
20 Dad 1970-02-02 10 9 30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL 9 Grandma Ann 1941-10-15 NULL NULL
8 Grandpa Ben 1940-10-21 NULL NULL 7 Grandma Sally 1943-08-23 NULL 6
with
ancestor_couples(husband, h_dob, wife, w_dob)
as
@ -233,6 +240,7 @@ select * from ancestor_couples;
husband h_dob wife w_dob
Dad 1970-02-02 Mom 1975-03-03
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
with recursive
ancestors
as
@ -256,7 +264,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
9 Grandma Ann 1941-10-15 NULL NULL
10 Grandpa Bill 1940-04-05 NULL NULL
8 Grandma Sally 1943-08-23 5 6
8 Grandpa Ben 1940-10-21 NULL NULL
7 Grandma Sally 1943-08-23 NULL 6
6 Grandgrandma Martha 1923-05-17 NULL NULL
with recursive
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
@ -286,6 +295,7 @@ from ancestor_couples;
h_name h_dob w_name w_dob
Dad 1970-02-02 Mom 1975-03-03
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
prepare stmt1 from "
with recursive
ancestors
@ -308,7 +318,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
8 Grandpa Ben 1940-10-21 NULL NULL
6 Grandgrandma Martha 1923-05-17 NULL NULL
execute stmt1;
id name dob father mother
@ -317,7 +328,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
8 Grandpa Ben 1940-10-21 NULL NULL
6 Grandgrandma Martha 1923-05-17 NULL NULL
deallocate prepare stmt1;
create view v1 as
@ -344,7 +356,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
8 Grandma Sally 1943-08-23 5 6
7 Grandma Sally 1943-08-23 NULL 6
8 Grandpa Ben 1940-10-21 NULL NULL
6 Grandgrandma Martha 1923-05-17 NULL NULL
create view v2 as
with recursive
@ -374,7 +387,8 @@ id name dob father mother
30 Mom 1975-03-03 8 7
9 Grandma Ann 1941-10-15 NULL NULL
10 Grandpa Bill 1940-04-05 NULL NULL
8 Grandma Sally 1943-08-23 5 6
8 Grandpa Ben 1940-10-21 NULL NULL
7 Grandma Sally 1943-08-23 NULL 6
6 Grandgrandma Martha 1923-05-17 NULL NULL
drop view v1,v2;
explain extended
@ -392,11 +406,314 @@ where p.id = a.father or p.id = a.mother
)
select * from ancestors;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 132 100.00
2 SUBQUERY folks ALL NULL NULL NULL NULL 11 100.00 Using where
3 UNCACHEABLE UNION p ALL NULL NULL NULL NULL 11 100.00
3 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 11 100.00 Using where; Using join buffer (flat, BNL join)
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 156 100.00
2 SUBQUERY folks ALL NULL NULL NULL NULL 12 100.00 Using where
3 UNCACHEABLE UNION p ALL NULL NULL NULL NULL 12 100.00
3 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 12 100.00 Using where; Using join buffer (flat, BNL join)
NULL UNION RESULT <union2,3> ALL NULL NULL NULL NULL NULL NULL
Warnings:
Note 1003 with recursive ancestors as (select `test`.`folks`.`id` AS `id`,`test`.`folks`.`name` AS `name`,`test`.`folks`.`dob` AS `dob`,`test`.`folks`.`father` AS `father`,`test`.`folks`.`mother` AS `mother` from `test`.`folks` where ((`test`.`folks`.`name` = 'Vasya') and (`test`.`folks`.`dob` = DATE'2000-01-01')) union select `p`.`id` AS `id`,`p`.`name` AS `name`,`p`.`dob` AS `dob`,`p`.`father` AS `father`,`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestors` `a` where ((`a`.`father` = `p`.`id`) or (`a`.`mother` = `p`.`id`)))select `ancestors`.`id` AS `id`,`ancestors`.`name` AS `name`,`ancestors`.`dob` AS `dob`,`ancestors`.`father` AS `father`,`ancestors`.`mother` AS `mother` from `ancestors`
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Vasya'
union
select mother from folks where name = 'Vasya'
union
select father from folks, ancestor_ids a where folks.id = a.id
union
select mother from folks, ancestor_ids a where folks.id = a.id
),
ancestors
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
id name dob father mother
20 Dad 1970-02-02 10 9
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
8 Grandpa Ben 1940-10-21 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
7 Grandma Sally 1943-08-23 NULL 6
6 Grandgrandma Martha 1923-05-17 NULL NULL
with recursive
ancestors
as
(
select *
from folks
where name = 'Vasya'
union all
select p.*
from folks as p, ancestors as fa
where p.id = fa.father
union all
select p.*
from folks as p, ancestors as ma
where p.id = ma.mother
)
select * from ancestors;
id name dob father mother
100 Vasya 2000-01-01 20 30
20 Dad 1970-02-02 10 9
30 Mom 1975-03-03 8 7
9 Grandma Ann 1941-10-15 NULL NULL
10 Grandpa Bill 1940-04-05 NULL NULL
8 Grandpa Ben 1940-10-21 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
7 Grandma Sally 1943-08-23 NULL 6
6 Grandgrandma Martha 1923-05-17 NULL NULL
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya' and father is not null
union all
select mother, 1 from folks where name = 'Vasya' and mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and (father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
set standards_compliant_cte=0;
set optimizer_switch='materialization=off,subquery_cache=off';
with recursive
ancestor_ids (id, generation)
as
(
select father from folks where name = 'Vasya' and father is not null
union all
select mother from folks where name = 'Vasya' and mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and (father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
ERROR HY000: WITH column list and SELECT field list have different column counts
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya' and father is not null
union all
select mother, 1 from folks where name = 'Vasya' and mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and father is not null and
(father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and mother is not null and
(mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
generation name
1 Dad
1 Mom
2 Grandpa Bill
2 Grandpa Ben
2 Grandma Ann
2 Grandma Sally
3 Grandgrandma Martha
set optimizer_switch=default;
set standards_compliant_cte=1;
with recursive
coupled_ancestor_ids (id)
as
(
select father from folks where name = 'Vasya' and father is not null
union
select mother from folks where name = 'Vasya' and mother is not null
union
select n.father
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
union
select n.mother
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
)
select p.* from coupled_ancestor_ids a, folks p
where a.id = p.id;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'coupled_ancestor_ids'
set statement standards_compliant_cte=0 for
with recursive
coupled_ancestor_ids (id)
as
(
select father from folks where name = 'Vasya' and father is not null
union
select mother from folks where name = 'Vasya' and mother is not null
union
select n.father
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
union
select n.mother
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
)
select p.* from coupled_ancestor_ids a, folks p
where a.id = p.id;
id name dob father mother
20 Dad 1970-02-02 10 9
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
8 Grandpa Ben 1940-10-21 NULL NULL
9 Grandma Ann 1941-10-15 NULL NULL
7 Grandma Sally 1943-08-23 NULL 6
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Vasya'
union
select mother from folks where name = 'Vasya'
union
select father from folks left join ancestor_ids a on folks.id = a.id
union
select mother from folks left join ancestor_ids a on folks.id = a.id
),
ancestors
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
set statement standards_compliant_cte=0 for
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Vasya'
union
select mother from folks where name = 'Vasya'
union
select father from folks left join ancestor_ids a on folks.id = a.id
union
select mother from folks left join ancestor_ids a on folks.id = a.id
),
ancestors
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
id name dob father mother
20 Dad 1970-02-02 10 9
30 Mom 1975-03-03 8 7
10 Grandpa Bill 1940-04-05 NULL NULL
8 Grandpa Ben 1940-10-21 NULL NULL
25 Uncle Jim 1968-11-18 8 7
9 Grandma Ann 1941-10-15 NULL NULL
7 Grandma Sally 1943-08-23 NULL 6
6 Grandgrandma Martha 1923-05-17 NULL NULL
27 Auntie Melinda 1971-03-29 NULL NULL
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya'
union
select mother, 1 from folks where name = 'Vasya'
union
select father, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
union
select mother, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
),
ancestors
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
generation name
1 Dad
1 Mom
2 Grandpa Bill
2 Grandpa Ben
2 Grandma Ann
2 Grandma Sally
3 Grandgrandma Martha
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya'
union
select mother, 1 from folks where name = 'Vasya'
union
select max(father), max(a.generation)+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
union
select max(mother), max(a.generation)+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
),
ancestors
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
ERROR HY000: Restrictions imposed on recursive definitions are violated for table 'ancestor_ids'
set statement standards_compliant_cte=0 for
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya'
union
select mother, 1 from folks where name = 'Vasya'
union
select max(father), a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
union
select max(mother), a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
),
ancestors
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
generation name
1 Dad
1 Mom
2 Grandpa Bill
2 Grandma Ann
drop table folks;

4
mysql-test/r/mysqld--help.result
View File

@ -1033,6 +1033,9 @@ The following options may be given as the first argument:
NO_ENGINE_SUBSTITUTION, PAD_CHAR_TO_FULL_LENGTH
--stack-trace Print a symbolic stack trace on failure
(Defaults to on; use --skip-stack-trace to disable.)
--standards-compliant-cte
Allow only standards compiant CTE
(Defaults to on; use --skip-standards-compliant-cte to disable.)
--stored-program-cache=#
The soft upper limit for number of cached stored routines
for one connection.
@ -1414,6 +1417,7 @@ slow-query-log FALSE
sort-buffer-size 2097152
sql-mode NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION
stack-trace TRUE
standards-compliant-cte TRUE
stored-program-cache 256
strict-password-validation TRUE
symbolic-links FALSE

267
mysql-test/t/cte_recursive.test
View File

@ -34,7 +34,8 @@ insert into folks values
(9, 'Grandma Ann', '1941-10-15', null, null),
(25, 'Uncle Jim', '1968-11-18', 8, 7),
(98, 'Sister Amy', '2001-06-20', 20, 30),
(8, 'Grandma Sally', '1943-08-23', 5, 6),
(7, 'Grandma Sally', '1943-08-23', null, 6),
(8, 'Grandpa Ben', '1940-10-21', null, null),
(6, 'Grandgrandma Martha', '1923-05-17', null, null),
(67, 'Cousin Eddie', '1992-02-28', 25, 27),
(27, 'Auntie Melinda', '1971-03-29', null, null);
@ -320,5 +321,269 @@ as
select * from ancestors;
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Vasya'
union
select mother from folks where name = 'Vasya'
union
select father from folks, ancestor_ids a where folks.id = a.id
union
select mother from folks, ancestor_ids a where folks.id = a.id
),
ancestors
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
with recursive
ancestors
as
(
select *
from folks
where name = 'Vasya'
union all
select p.*
from folks as p, ancestors as fa
where p.id = fa.father
union all
select p.*
from folks as p, ancestors as ma
where p.id = ma.mother
)
select * from ancestors;
--ERROR ER_NOT_STANDARDS_COMPLIANT_RECURSIVE
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya' and father is not null
union all
select mother, 1 from folks where name = 'Vasya' and mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and (father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
set standards_compliant_cte=0;
set optimizer_switch='materialization=off,subquery_cache=off';
--ERROR ER_WITH_COL_WRONG_LIST
with recursive
ancestor_ids (id, generation)
as
(
select father from folks where name = 'Vasya' and father is not null
union all
select mother from folks where name = 'Vasya' and mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and (father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and (mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya' and father is not null
union all
select mother, 1 from folks where name = 'Vasya' and mother is not null
union all
select father, fa.generation+1 from folks, ancestor_ids fa
where folks.id = fa.id and father is not null and
(father not in (select id from ancestor_ids))
union all
select mother, ma.generation+1 from folks, ancestor_ids ma
where folks.id = ma.id and mother is not null and
(mother not in (select id from ancestor_ids))
)
select generation, name from ancestor_ids a, folks
where a.id = folks.id;
set optimizer_switch=default;
set standards_compliant_cte=1;
--ERROR ER_NOT_STANDARDS_COMPLIANT_RECURSIVE
with recursive
coupled_ancestor_ids (id)
as
(
select father from folks where name = 'Vasya' and father is not null
union
select mother from folks where name = 'Vasya' and mother is not null
union
select n.father
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
union
select n.mother
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
)
select p.* from coupled_ancestor_ids a, folks p
where a.id = p.id;
set statement standards_compliant_cte=0 for
with recursive
coupled_ancestor_ids (id)
as
(
select father from folks where name = 'Vasya' and father is not null
union
select mother from folks where name = 'Vasya' and mother is not null
union
select n.father
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
union
select n.mother
from folks, coupled_ancestor_ids fa, coupled_ancestor_ids ma, folks n
where folks.father = fa.id and folks.mother = ma.id and
(fa.id = n.id or ma.id = n.id) and
n.father is not null and n.mother is not null
)
select p.* from coupled_ancestor_ids a, folks p
where a.id = p.id;
--ERROR ER_NOT_STANDARDS_COMPLIANT_RECURSIVE
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Vasya'
union
select mother from folks where name = 'Vasya'
union
select father from folks left join ancestor_ids a on folks.id = a.id
union
select mother from folks left join ancestor_ids a on folks.id = a.id
),
ancestors
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
set statement standards_compliant_cte=0 for
with recursive
ancestor_ids (id)
as
(
select father from folks where name = 'Vasya'
union
select mother from folks where name = 'Vasya'
union
select father from folks left join ancestor_ids a on folks.id = a.id
union
select mother from folks left join ancestor_ids a on folks.id = a.id
),
ancestors
as
(
select p.* from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya'
union
select mother, 1 from folks where name = 'Vasya'
union
select father, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
union
select mother, a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
),
ancestors
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
--ERROR ER_NOT_STANDARDS_COMPLIANT_RECURSIVE
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya'
union
select mother, 1 from folks where name = 'Vasya'
union
select max(father), max(a.generation)+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
union
select max(mother), max(a.generation)+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
),
ancestors
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
set statement standards_compliant_cte=0 for
with recursive
ancestor_ids (id, generation)
as
(
select father, 1 from folks where name = 'Vasya'
union
select mother, 1 from folks where name = 'Vasya'
union
select max(father), a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
union
select max(mother), a.generation+1 from folks, ancestor_ids a
where folks.id = a.id
group by a.generation
),
ancestors
as
(
select generation, name from folks as p, ancestor_ids as a
where p.id = a.id
)
select * from ancestors;
drop table folks;

2
sql/share/errmsg-utf8.txt
View File

@ -7156,6 +7156,8 @@ ER_RECURSIVE_WITHOUT_ANCHORS
eng "No anchors for recursive WITH element '%s'"
ER_REF_TO_RECURSIVE_WITH_TABLE_IN_DERIVED
eng "Reference to recursive WITH table '%s' in materiazed derived"
ER_NOT_STANDARDS_COMPLIANT_RECURSIVE
eng "Restrictions imposed on recursive definitions are violated for table '%s'"
#
# Internal errors, not used
#

1
sql/sql_class.h
View File

@ -628,6 +628,7 @@ typedef struct system_variables
my_bool old_alter_table;
my_bool old_passwords;
my_bool big_tables;
my_bool only_standards_compliant_cte;
my_bool query_cache_strip_comments;
my_bool sql_log_slow;
my_bool sql_log_bin;

53
sql/sql_cte.cc
View File

@ -173,8 +173,10 @@ bool With_element::check_dependencies_in_spec(THD *thd)
}
void With_element::check_dependencies_in_select(st_select_lex *sl, table_map &dep_map)
void With_element::check_dependencies_in_select(st_select_lex *sl,
table_map &dep_map)
{
bool is_sq_select= sl->master_unit()->item != NULL;
for (TABLE_LIST *tbl= sl->table_list.first; tbl; tbl= tbl->next_local)
{
tbl->with_internal_reference_map= 0;
@ -186,6 +188,8 @@ void With_element::check_dependencies_in_select(st_select_lex *sl, table_map &de
{
dep_map|= tbl->with->get_elem_map();
tbl->with_internal_reference_map= get_elem_map();
if (is_sq_select)
sq_dep_map|= tbl->with->get_elem_map();
}
}
st_select_lex_unit *inner_unit= sl->first_inner_unit();
@ -730,7 +734,7 @@ bool TABLE_LIST::is_with_table_recursive_reference()
bool st_select_lex::check_unrestricted_recursive()
bool st_select_lex::check_unrestricted_recursive(bool only_standards_compliant)
{
With_element *with_elem= get_with_element();
if (!with_elem ||!with_elem->is_recursive)
@ -742,8 +746,16 @@ bool st_select_lex::check_unrestricted_recursive()
encountered))
return true;
with_elem->owner->unrestricted|= unrestricted;
if (with_sum_func)
if (with_sum_func ||
(with_elem->sq_dep_map & with_elem->mutually_recursive))
with_elem->owner->unrestricted|= with_elem->mutually_recursive;
if (only_standards_compliant && with_elem->is_unrestricted())
{
my_error(ER_NOT_STANDARDS_COMPLIANT_RECURSIVE,
MYF(0), with_elem->query_name->str);
return true;
}
return false;
}
@ -756,24 +768,27 @@ bool With_element::check_unrestricted_recursive(st_select_lex *sel,
TABLE_LIST *tbl;
while ((tbl= ti++))
{
if (tbl->get_unit() && !tbl->is_with_table())
{
st_select_lex_unit *unit= tbl->get_unit();
if (tbl->is_materialized_derived())
st_select_lex_unit *unit= tbl->get_unit();
if (unit)
{
if(!tbl->is_with_table())
{
table_map dep_map;
check_dependencies_in_unit(unit, dep_map);
if (dep_map & get_elem_map())
if (tbl->is_materialized_derived())
{
my_error(ER_REF_TO_RECURSIVE_WITH_TABLE_IN_DERIVED,
MYF(0), query_name->str);
return true;
table_map dep_map;
check_dependencies_in_unit(unit, dep_map);
if (dep_map & get_elem_map())
{
my_error(ER_REF_TO_RECURSIVE_WITH_TABLE_IN_DERIVED,
MYF(0), query_name->str);
return true;
}
}
if (check_unrestricted_recursive(unit->first_select(),
unrestricted,
encountered))
return true;
}
if (check_unrestricted_recursive(unit->first_select(),
unrestricted,
encountered))
return true;
if (!(tbl->is_recursive_with_table() && unit->with_element->owner == owner))
continue;
With_element *with_elem= unit->with_element;
@ -792,8 +807,8 @@ bool With_element::check_unrestricted_recursive(st_select_lex *sel,
if (encountered & with_elem->get_elem_map())
{
uint cnt= 0;
table_map mutually_recursive= with_elem->mutually_recursive;
for (table_map map= mutually_recursive >> with_elem->number;
table_map encountered_mr= encountered & with_elem->mutually_recursive;
for (table_map map= encountered_mr >> with_elem->number;
map != 0;
map>>= 1)
{

12
sql/sql_cte.h
View File

@ -35,6 +35,7 @@ private:
directly or indirectly from the i-th with element.
*/
table_map derived_dep_map;
table_map sq_dep_map;
table_map work_dep_map; // dependency map used for work
/* Dependency map of with elements mutually recursive with this with element */
table_map mutually_recursive;
@ -90,7 +91,7 @@ public:
List <LEX_STRING> list,
st_select_lex_unit *unit)
: next_elem(NULL), base_dep_map(0), derived_dep_map(0),
work_dep_map(0), mutually_recursive(0),
sq_dep_map(0), work_dep_map(0), mutually_recursive(0),
references(0), table(NULL),
query_name(name), column_list(list), spec(unit),
is_recursive(false), with_anchor(false),
@ -151,7 +152,8 @@ public:
friend class With_clause;
friend
bool st_select_lex::check_unrestricted_recursive();
bool
st_select_lex::check_unrestricted_recursive(bool only_standard_compliant);
friend
bool TABLE_LIST::is_with_table_recursive_reference();
};
@ -241,9 +243,11 @@ public:
friend class With_element;
friend
bool check_dependencies_in_with_clauses(THD *thd, With_clause *with_clauses_list);
bool
check_dependencies_in_with_clauses(THD *thd, With_clause *with_clauses_list);
friend
bool st_select_lex::check_unrestricted_recursive();
bool
st_select_lex::check_unrestricted_recursive(bool only_standard_compliant);
};

2
sql/sql_derived.cc
View File

@ -771,7 +771,7 @@ exit:
*/
if (res)
{
if (derived->table)
if (derived->table && !derived->is_with_table_recursive_reference())
free_tmp_table(thd, derived->table);
delete derived->derived_result;
}

3
sql/sql_lex.cc
View File

@ -3189,6 +3189,8 @@ void st_select_lex_unit::set_limit(st_select_lex *sl)
bool st_select_lex_unit::union_needs_tmp_table()
{
if (with_element && with_element->is_recursive)
return true;
return union_distinct != NULL ||
global_parameters()->order_list.elements != 0 ||
thd->lex->sql_command == SQLCOM_INSERT_SELECT ||
@ -4236,6 +4238,7 @@ void st_select_lex::update_correlated_cache()
while ((tl= ti++))
{
// is_correlated|= tl->is_with_table_recursive_reference();
if (tl->on_expr)
is_correlated|= MY_TEST(tl->on_expr->used_tables() & OUTER_REF_TABLE_BIT);
for (TABLE_LIST *embedding= tl->embedding ; embedding ;

2
sql/sql_lex.h
View File

@ -1108,7 +1108,7 @@ public:
return master_unit()->with_element;
}
With_element *find_table_def_in_with_clauses(TABLE_LIST *table);
bool check_unrestricted_recursive();
bool check_unrestricted_recursive(bool only_standards_compliant);
List<Window_spec> window_specs;

8
sql/sql_select.cc
View File

@ -816,8 +816,6 @@ JOIN::prepare(TABLE_LIST *tables_init,
&hidden_group_fields,
&select_lex->select_n_reserved))
DBUG_RETURN(-1);
if (select_lex->check_unrestricted_recursive())
DBUG_RETURN(-1);
/* Resolve the ORDER BY that was skipped, then remove it. */
if (skip_order_by && select_lex !=
select_lex->master_unit()->global_parameters())
@ -861,6 +859,12 @@ JOIN::prepare(TABLE_LIST *tables_init,
With_clause *with_clause=select_lex->get_with_clause();
if (with_clause && with_clause->prepare_unreferenced_elements(thd))
DBUG_RETURN(1);
With_element *with_elem= select_lex->get_with_element();
if (with_elem &&
select_lex->check_unrestricted_recursive(
thd->variables.only_standards_compliant_cte))
DBUG_RETURN(-1);
int res= check_and_do_in_subquery_rewrites(this);

20
sql/sql_union.cc
View File

@ -266,14 +266,18 @@ void select_union::cleanup()
void select_union_recursive::cleanup()
{
select_union::cleanup();
free_tmp_table(thd, table);
if (table)
{
select_union::cleanup();
free_tmp_table(thd, table);
}
incr_table->file->extra(HA_EXTRA_RESET_STATE);
incr_table->file->ha_delete_all_rows();
//free_io_cache(incr_table);
//filesort_free_buffers(incr_table,0);
free_tmp_table(thd, incr_table);
if (incr_table)
{
incr_table->file->extra(HA_EXTRA_RESET_STATE);
incr_table->file->ha_delete_all_rows();
free_tmp_table(thd, incr_table);
}
List_iterator<TABLE> it(rec_tables);
TABLE *tab;
@ -281,8 +285,6 @@ void select_union_recursive::cleanup()
{
tab->file->extra(HA_EXTRA_RESET_STATE);
tab->file->ha_delete_all_rows();
//free_io_cache(tab);
//filesort_free_buffers(tab,0);
free_tmp_table(thd, tab);
}
}

6
sql/sys_vars.cc
View File

@ -3156,6 +3156,12 @@ static Sys_var_charptr Sys_ssl_crlpath(
READ_ONLY GLOBAL_VAR(opt_ssl_crlpath), SSL_OPT(OPT_SSL_CRLPATH),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_mybool Sys_standards_compliant_cte(
"standards_compliant_cte",
"Allow only standards compiant CTE",
SESSION_VAR(only_standards_compliant_cte), CMD_LINE(OPT_ARG),
DEFAULT(TRUE));
// why ENUM and not BOOL ?
static const char *updatable_views_with_limit_names[]= {"NO", "YES", 0};