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907b236112
is not supported Allowed to use recursive references in derived tables. As a result usage of recursive references in operands of INTERSECT / EXCEPT is now supported.
2310 lines
52 KiB
Text
2310 lines
52 KiB
Text
create table t1 (a int, b varchar(32));
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insert into t1 values
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(4,'aaaa' ), (7,'bb'), (1,'ccc'), (4,'dd');
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insert into t1 values
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(3,'eee'), (7,'bb'), (1,'fff'), (4,'ggg');
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--ERROR ER_UNACCEPTABLE_MUTUAL_RECURSION
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with recursive
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t as
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(
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select * from t1 where t1.b >= 'c'
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union
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select * from r
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),
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r as
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(
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select * from t
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union
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select t1.* from t1,r where r.a+1 = t1.a
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)
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select * from r;
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--ERROR ER_UNACCEPTABLE_MUTUAL_RECURSION
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with recursive
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a1(a,b) as
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(select * from t1 where t1.a>3
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union
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select * from b1 where b1.a >3
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union
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select * from c1 where c1.a>3),
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b1(a,b) as
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(select * from a1 where a1.b > 'ccc'
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union
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select * from c1 where c1.b > 'ddd'),
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c1(a,b) as
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(select * from a1 where a1.a<6 and a1.b< 'zz'
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union
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select * from b1 where b1.b > 'auu')
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select * from c1;
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drop table t1;
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--echo # WITH RECURSIVE vs just WITH
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create table t1 (a int);
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insert into t1 values
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(0), (1), (2), (3), (4);
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create table t2 (a int);
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insert into t2 values
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(1), (2), (3), (4), (5);
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--echo # just WITH : s refers to t defined after s
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--ERROR ER_NO_SUCH_TABLE
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with
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s(a) as (select t.a + 10 from t),
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t(a) as (select t1.a from t1)
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select * from s;
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--echo # WITH RECURSIVE: s refers to t defined after s
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with recursive
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s(a) as (select t.a + 10 from t),
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t(a) as (select t1.a from t1)
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select * from s;
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--echo # just WITH : defined t1 is non-recursive and uses base tables t1,t2
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with
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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explain
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with
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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--echo #WITH RECURSIVE : defined t1 is recursive and uses only base table t2
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with recursive
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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explain
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with recursive
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a from t1,t2 where t1.a+1=t2.a
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)
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select * from t1;
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--echo # just WITH : types of t1 columns are determined by all parts of union
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create view v1 as
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with
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a+1 from t1,t2 where t1.a=t2.a
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)
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select * from t1;
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show columns from v1;
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--echo # WITH RECURSIVE : types of t1 columns are determined by anchor parts
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create view v2 as
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with recursive
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t1 as
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(
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select a from t2 where t2.a=3
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union
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select t2.a+1 from t1,t2 where t1.a=t2.a
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)
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select * from t1;
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show columns from v2;
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drop view v1,v2;
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drop table t1,t2;
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create table folks(id int, name char(32), dob date, father int, mother int);
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insert into folks values
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(100, 'Me', '2000-01-01', 20, 30),
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(20, 'Dad', '1970-02-02', 10, 9),
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(30, 'Mom', '1975-03-03', 8, 7),
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(10, 'Grandpa Bill', '1940-04-05', null, null),
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(9, 'Grandma Ann', '1941-10-15', null, null),
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(25, 'Uncle Jim', '1968-11-18', 8, 7),
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(98, 'Sister Amy', '2001-06-20', 20, 30),
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(7, 'Grandma Sally', '1943-08-23', null, 6),
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(8, 'Grandpa Ben', '1940-10-21', null, null),
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(6, 'Grandgrandma Martha', '1923-05-17', null, null),
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(67, 'Cousin Eddie', '1992-02-28', 25, 27),
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(27, 'Auntie Melinda', '1971-03-29', null, null);
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--echo # simple recursion with one anchor and one recursive select
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--echo # the anchor is the first select in the specification
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me' and dob = '2000-01-01'
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union
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select p.id, p.name, p.dob, p.father, p.mother
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from folks as p, ancestors AS a
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where p.id = a.father or p.id = a.mother
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)
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select * from ancestors;
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--echo # simple recursion with one anchor and one recursive select
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--echo # the anchor is the last select in the specification
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with recursive
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ancestors
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as
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(
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select p.*
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from folks as p, ancestors AS a
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where p.id = a.father or p.id = a.mother
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union
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select *
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from folks
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where name = 'Me' and dob = '2000-01-01'
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)
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select * from ancestors;
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--echo # simple recursion with one anchor and one recursive select
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--echo # the anchor is the first select in the specification
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Cousin Eddie'
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union
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select p.*
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from folks as p, ancestors as a
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where p.id = a.father or p.id = a.mother
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)
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select * from ancestors;
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--echo # simple recursion with or in anchor and or in recursive part
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me' or name='Sister Amy'
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union
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select p.*
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from folks as p, ancestors as a
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where p.id = a.father or p.id = a.mother
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)
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select * from ancestors;
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--echo # two recursive definition, one uses another
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with recursive
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prev_gen
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as
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(
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select folks.*
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from folks, prev_gen
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where folks.id=prev_gen.father or folks.id=prev_gen.mother
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union
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select *
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from folks
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where name='Me'
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),
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ancestors
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as
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(
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select *
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from folks
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where name='Me'
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union
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select *
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from ancestors
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union
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select *
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from prev_gen
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)
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select ancestors.name, ancestors.dob from ancestors;
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--echo # recursive definition with two attached non-recursive
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with recursive
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ancestors(id,name,dob)
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as
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(
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with
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father(child_id,id,name,dob)
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as
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(
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select folks.id, f.id, f.name, f.dob
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from folks, folks f
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where folks.father=f.id
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),
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mother(child_id,id,name,dob)
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as
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(
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select folks.id, m.id, m.name, m.dob
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from folks, folks m
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where folks.mother=m.id
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)
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select folks.id, folks.name, folks.dob
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from folks
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where name='Me'
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union
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select f.id, f.name, f.dob
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from ancestors a, father f
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where f.child_id=a.id
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union
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select m.id, m.name, m.dob
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from ancestors a, mother m
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where m.child_id=a.id
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)
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select ancestors.name, ancestors.dob from ancestors;
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--echo # simple recursion with one anchor and one recursive select
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--echo # the anchor is the first select in the specification
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with recursive
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descendants
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as
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(
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select *
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from folks
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where name = 'Grandpa Bill'
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union
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select folks.*
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from folks, descendants as d
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where d.id=folks.father or d.id=folks.mother
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)
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select * from descendants;
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--echo # simple recursion with one anchor and one recursive select
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--echo # the anchor is the first select in the specification
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with recursive
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descendants
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as
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(
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select *
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from folks
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where name = 'Grandma Sally'
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union
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select folks.*
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from folks, descendants as d
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where d.id=folks.father or d.id=folks.mother
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)
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select * from descendants;
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--echo # simple recursive table used three times in the main query
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me' and dob = '2000-01-01'
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union
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select p.*
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from folks as p, ancestors AS a
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where p.id = a.father OR p.id = a.mother
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)
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select *
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from ancestors t1, ancestors t2
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where exists (select * from ancestors a
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where a.father=t1.id AND a.mother=t2.id);
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--echo # simple recursive table used three times in the main query
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with
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ancestor_couples(husband, h_dob, wife, w_dob)
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as
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(
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me'
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union
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select p.*
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from folks as p, ancestors AS a
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where p.id = a.father OR p.id = a.mother
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)
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select t1.name, t1.dob, t2.name, t2.dob
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from ancestors t1, ancestors t2
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where exists (select * from ancestors a
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where a.father=t1.id AND a.mother=t2.id)
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)
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select * from ancestor_couples;
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--echo # simple recursion with two selects in recursive part
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with recursive
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ancestors
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as
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(
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select *
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from folks
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where name = 'Me'
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union
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select p.*
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from folks as p, ancestors as fa
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where p.id = fa.father
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union
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select p.*
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from folks as p, ancestors as ma
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where p.id = ma.mother
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)
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select * from ancestors;
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--echo # mutual recursion with renaming
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with recursive
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ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
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w_id, w_name, w_dob, w_father, w_mother)
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as
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(
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select h.*, w.*
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from folks h, folks w, coupled_ancestors a
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where a.father = h.id AND a.mother = w.id
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union
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select h.*, w.*
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from folks v, folks h, folks w
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where v.name = 'Me' and
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(v.father = h.id AND v.mother= w.id)
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select h_id, h_name, h_dob, h_father, h_mother
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from ancestor_couples
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union
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select w_id, w_name, w_dob, w_father, w_mother
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from ancestor_couples
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)
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select h_name, h_dob, w_name, w_dob
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from ancestor_couples;
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--echo # mutual recursion with union all
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with recursive
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ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
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w_id, w_name, w_dob, w_father, w_mother)
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as
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(
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select h.*, w.*
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from folks h, folks w, coupled_ancestors a
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where a.father = h.id AND a.mother = w.id
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union
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select h.*, w.*
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from folks v, folks h, folks w
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where v.name = 'Me' and
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(v.father = h.id AND v.mother= w.id)
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select h_id, h_name, h_dob, h_father, h_mother
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from ancestor_couples
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union all
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select w_id, w_name, w_dob, w_father, w_mother
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from ancestor_couples
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)
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select h_name, h_dob, w_name, w_dob
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from ancestor_couples;
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--echo # mutual recursion with renaming
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with recursive
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ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
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w_id, w_name, w_dob, w_father, w_mother)
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as
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(
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select h.*, w.*
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from folks h, folks w, coupled_ancestors a
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where a.father = h.id AND a.mother = w.id
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union
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select h.*, w.*
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from folks v, folks h, folks w
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where v.name = 'Me' and
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(v.father = h.id AND v.mother= w.id)
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),
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coupled_ancestors (id, name, dob, father, mother)
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as
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(
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select h_id, h_name, h_dob, h_father, h_mother
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from ancestor_couples
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union
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select w_id, w_name, w_dob, w_father, w_mother
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from ancestor_couples
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)
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select h_name, h_dob, w_name, w_dob
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from ancestor_couples;
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|
|
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--echo # mutual recursion with union all
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with recursive
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ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
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w_id, w_name, w_dob, w_father, w_mother)
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as
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|
(
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select h.*, w.*
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|
from folks h, folks w, coupled_ancestors a
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|
where a.father = h.id AND a.mother = w.id
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),
|
|
coupled_ancestors (id, name, dob, father, mother)
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as
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|
(
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select *
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from folks
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where name = 'Me'
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union all
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select h_id, h_name, h_dob, h_father, h_mother
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|
from ancestor_couples
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union all
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|
select w_id, w_name, w_dob, w_father, w_mother
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|
from ancestor_couples
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)
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select h_name, h_dob, w_name, w_dob
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from ancestor_couples;
|
|
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|
--echo # mutual recursion with one select in the first definition
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with recursive
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ancestor_couple_ids(h_id, w_id)
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as
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(
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select a.father, a.mother
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from coupled_ancestors a
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|
where a.father is not null and a.mother is not null
|
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),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
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|
union all
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|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
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union all
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|
select p.*
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|
from folks p, ancestor_couple_ids ma
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|
where p.id = ma.w_id
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)
|
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select *
|
|
from ancestor_couple_ids;
|
|
|
|
|
|
--echo # join of a mutually recursive table with base tables
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|
with recursive
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|
ancestor_couple_ids(h_id, w_id)
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|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
where a.father is not null and a.mother is not null
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select h.name, h.dob, w.name, w.dob
|
|
from ancestor_couple_ids c, folks h, folks w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
|
|
|
|
--echo # join of two mutually recursive tables
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
where a.father is not null and a.mother is not null
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select h.name, h.dob, w.name, w.dob
|
|
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
|
|
explain extended
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
where a.father is not null and a.mother is not null
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select h.name, h.dob, w.name, w.dob
|
|
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
|
|
|
|
--echo # simple mutual recursion
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select *
|
|
from ancestor_couple_ids;
|
|
|
|
|
|
--echo # join of two mutually recursive tables
|
|
with recursive
|
|
ancestor_couple_ids(h_id, w_id)
|
|
as
|
|
(
|
|
select a.father, a.mother
|
|
from coupled_ancestors a
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids fa
|
|
where p.id = fa.h_id
|
|
union all
|
|
select p.*
|
|
from folks p, ancestor_couple_ids ma
|
|
where p.id = ma.w_id
|
|
)
|
|
select h.name, h.dob, w.name, w.dob
|
|
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
|
|
where c.h_id = h.id and c.w_id= w.id;
|
|
|
|
|
|
--echo # execution of prepared query using a recursive table
|
|
prepare stmt1 from "
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me' and dob = '2000-01-01'
|
|
union
|
|
select p.id, p.name, p.dob, p.father, p.mother
|
|
from folks as p, ancestors AS a
|
|
where p.id = a.father or p.id = a.mother
|
|
)
|
|
select * from ancestors;
|
|
";
|
|
|
|
execute stmt1;
|
|
execute stmt1;
|
|
|
|
deallocate prepare stmt1;
|
|
|
|
|
|
--echo # view using a recursive table
|
|
create view v1 as
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me' and dob = '2000-01-01'
|
|
union
|
|
select p.id, p.name, p.dob, p.father, p.mother
|
|
from folks as p, ancestors AS a
|
|
where p.id = a.father or p.id = a.mother
|
|
)
|
|
select * from ancestors;
|
|
|
|
show create view v1;
|
|
|
|
select * from v1;
|
|
|
|
create view v2 as
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as fa
|
|
where p.id = fa.father
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as ma
|
|
where p.id = ma.mother
|
|
)
|
|
select * from ancestors;
|
|
|
|
show create view v2;
|
|
|
|
select * from v2;
|
|
|
|
drop view v1,v2;
|
|
|
|
|
|
explain extended
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me' and dob = '2000-01-01'
|
|
union
|
|
select p.id, p.name, p.dob, p.father, p.mother
|
|
from folks as p, ancestors AS a
|
|
where p.id = a.father or p.id = a.mother
|
|
)
|
|
select * from ancestors;
|
|
|
|
|
|
--echo # recursive spec with two anchor selects and two recursive ones
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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;
|
|
|
|
|
|
--echo # recursive spec using union all
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
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_STANDARD_COMPLIANT_RECURSIVE
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me' and father is not null
|
|
union all
|
|
select mother, 1 from folks where name = 'Me' 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 standard_compliant_cte=0;
|
|
|
|
--ERROR ER_WITH_COL_WRONG_LIST
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me' and father is not null
|
|
union all
|
|
select mother from folks where name = 'Me' 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 = 'Me' and father is not null
|
|
union all
|
|
select mother, 1 from folks where name = 'Me' 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 standard_compliant_cte=1;
|
|
|
|
--ERROR ER_NOT_STANDARD_COMPLIANT_RECURSIVE
|
|
with recursive
|
|
coupled_ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me' and father is not null
|
|
union
|
|
select mother from folks where name = 'Me' 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 standard_compliant_cte=0 for
|
|
with recursive
|
|
coupled_ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me' and father is not null
|
|
union
|
|
select mother from folks where name = 'Me' 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_STANDARD_COMPLIANT_RECURSIVE
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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 standard_compliant_cte=0 for
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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 = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
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_STANDARD_COMPLIANT_RECURSIVE
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
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 standard_compliant_cte=0 for
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
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;
|
|
|
|
set statement max_recursive_iterations=1 for
|
|
with recursive
|
|
ancestor_ids (id, generation)
|
|
as
|
|
(
|
|
select father, 1 from folks where name = 'Me'
|
|
union
|
|
select mother, 1 from folks where name = 'Me'
|
|
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;
|
|
|
|
--echo # query with recursive tables using key access
|
|
|
|
alter table folks add primary key (id);
|
|
|
|
explain
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as fa
|
|
where p.id = fa.father
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as ma
|
|
where p.id = ma.mother
|
|
)
|
|
select * from ancestors;
|
|
|
|
|
|
with recursive
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name = 'Me'
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as fa
|
|
where p.id = fa.father
|
|
union
|
|
select p.*
|
|
from folks as p, ancestors as ma
|
|
where p.id = ma.mother
|
|
)
|
|
select * from ancestors;
|
|
|
|
|
|
--echo #
|
|
--echo # EXPLAIN FORMAT=JSON on a query where one recursive CTE uses another:
|
|
--echo #
|
|
explain
|
|
with recursive
|
|
prev_gen
|
|
as
|
|
(
|
|
select folks.*
|
|
from folks, prev_gen
|
|
where folks.id=prev_gen.father or folks.id=prev_gen.mother
|
|
union
|
|
select *
|
|
from folks
|
|
where name='Me'
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name='Me'
|
|
union
|
|
select *
|
|
from ancestors
|
|
union
|
|
select *
|
|
from prev_gen
|
|
)
|
|
select ancestors.name, ancestors.dob from ancestors;
|
|
|
|
explain FORMAT=JSON
|
|
with recursive
|
|
prev_gen
|
|
as
|
|
(
|
|
select folks.*
|
|
from folks, prev_gen
|
|
where folks.id=prev_gen.father or folks.id=prev_gen.mother
|
|
union
|
|
select *
|
|
from folks
|
|
where name='Me'
|
|
),
|
|
ancestors
|
|
as
|
|
(
|
|
select *
|
|
from folks
|
|
where name='Me2'
|
|
union
|
|
select *
|
|
from ancestors where id < 234
|
|
union
|
|
select *
|
|
from prev_gen where id < 345
|
|
)
|
|
select ancestors.name, ancestors.dob from ancestors;
|
|
|
|
--echo #
|
|
explain format=json
|
|
with recursive
|
|
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
|
|
w_id, w_name, w_dob, w_father, w_mother)
|
|
as
|
|
(
|
|
select h.*, w.*
|
|
from folks h, folks w, coupled_ancestors a
|
|
where a.father = h.id AND a.mother = w.id
|
|
union
|
|
select h.*, w.*
|
|
from folks v, folks h, folks w
|
|
where v.name = 'Me' and
|
|
(v.father = h.id AND v.mother= w.id)
|
|
),
|
|
coupled_ancestors (id, name, dob, father, mother)
|
|
as
|
|
(
|
|
select h_id, h_name, h_dob, h_father, h_mother
|
|
from ancestor_couples
|
|
union all
|
|
select w_id, w_name, w_dob, w_father, w_mother
|
|
from ancestor_couples
|
|
)
|
|
select h_name, h_dob, w_name, w_dob
|
|
from ancestor_couples;
|
|
|
|
|
|
create table my_ancestors
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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
|
|
)
|
|
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
|
|
|
|
select * from my_ancestors;
|
|
|
|
delete from my_ancestors;
|
|
|
|
insert into my_ancestors
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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
|
|
)
|
|
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
|
|
|
|
select * from my_ancestors;
|
|
|
|
drop table my_ancestors;
|
|
|
|
--echo #
|
|
--echo # MDEV-10883: execution of prepared statement from SELECT
|
|
--echo # with recursive CTE that renames columns
|
|
--echo #
|
|
|
|
prepare stmt from"
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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
|
|
)
|
|
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
|
|
";
|
|
execute stmt;
|
|
deallocate prepare stmt;
|
|
|
|
--echo #
|
|
--echo # MDEV-10881: execution of prepared statement from
|
|
--echo # CREATE ... SELECT, INSERT ... SELECT
|
|
--echo #
|
|
|
|
prepare stmt from"
|
|
create table my_ancestors
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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
|
|
)
|
|
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
|
|
";
|
|
execute stmt;
|
|
deallocate prepare stmt;
|
|
select * from my_ancestors;
|
|
|
|
delete from my_ancestors;
|
|
|
|
prepare stmt from"
|
|
insert into my_ancestors
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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
|
|
)
|
|
select p.* from folks as p, ancestor_ids as a where p.id = a.id;
|
|
";
|
|
execute stmt;
|
|
deallocate prepare stmt;
|
|
select * from my_ancestors;
|
|
|
|
drop table my_ancestors;
|
|
|
|
--echo #
|
|
--echo # MDEV-10933: WITH clause together with SELECT in parenthesis
|
|
--echo # CREATE SELECT
|
|
--echo #
|
|
|
|
create table my_ancestors
|
|
(
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
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
|
|
)
|
|
select p.* from folks as p, ancestor_ids as a where p.id = a.id
|
|
);
|
|
select * from my_ancestors;
|
|
drop table my_ancestors;
|
|
|
|
drop table folks;
|
|
|
|
--echo #
|
|
--echo # MDEV-10372: [bb-10.2-mdev9864 tree] EXPLAIN with recursive CTE enters endless recursion
|
|
--echo #
|
|
create table t1(a int);
|
|
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
|
|
|
explain format=json
|
|
with recursive t as (select a from t1 union select a+10 from t where a < 1000)
|
|
select * from t;
|
|
|
|
drop table t1;
|
|
|
|
|
|
--echo #
|
|
--echo # MDEV-10737: recursive union with several anchors at the end
|
|
--echo #
|
|
|
|
WITH RECURSIVE cte(n) AS
|
|
( SELECT n+1 FROM cte WHERE n < 5 UNION SELECT 1 UNION SELECT 1 )
|
|
SELECT * FROM cte;
|
|
|
|
--echo #
|
|
--echo # MDEV-10736: recursive definition with anchor over a table with blob
|
|
--echo #
|
|
|
|
CREATE TABLE t1 (f VARCHAR(1024));
|
|
WITH RECURSIVE cte(f) AS
|
|
(SELECT t1.f FROM t1 UNION ALL SELECT cte.f FROM cte)
|
|
SELECT * FROM cte as t;
|
|
DROP TABLE t1;
|
|
|
|
--echo #
|
|
--echo # MDEV-10899: mergeable derived in the spec of recursive CTE
|
|
--echo #
|
|
|
|
create table t1 (a int);
|
|
insert into t1 values
|
|
(0), (1), (2), (3), (4);
|
|
create table t2 (a int);
|
|
insert into t2 values
|
|
(1), (2), (3), (4), (5);
|
|
|
|
with recursive
|
|
t1 as
|
|
(
|
|
select x.a from (select a from t2 where t2.a=3) x
|
|
union
|
|
select t2.a from t1,t2 where t1.a+1=t2.a
|
|
)
|
|
select * from t1;
|
|
|
|
explain
|
|
with recursive
|
|
t1 as
|
|
(
|
|
select x.a from (select a from t2 where t2.a=3) x
|
|
union
|
|
select t2.a from t1,t2 where t1.a+1=t2.a
|
|
)
|
|
select * from t1;
|
|
|
|
drop table t1,t2;
|
|
|
|
--echo #
|
|
--echo # MDEV-11278: non-mergeable view in the spec of recursive CTE
|
|
--echo #
|
|
|
|
create table t1 (a int);
|
|
insert into t1 values
|
|
(0), (1), (2), (3), (4);
|
|
create table t2 (a int);
|
|
insert into t2 values
|
|
(1), (2), (3), (4), (5);
|
|
|
|
create view v1 as
|
|
select a from t2 where a < 3
|
|
union
|
|
select a from t2 where a > 4;
|
|
|
|
with recursive
|
|
t1 as
|
|
(
|
|
select a from v1 where a=1
|
|
union
|
|
select v1.a from t1,v1 where t1.a+1=v1.a
|
|
)
|
|
select * from t1;
|
|
|
|
drop view v1;
|
|
drop table t1,t2;
|
|
|
|
|
|
--echo #
|
|
--echo # MDEV-11259: recursive CTE with concatenation operation
|
|
--echo #
|
|
|
|
DROP TABLE IF EXISTS edges;
|
|
CREATE TABLE edges(
|
|
a int(10) unsigned NOT NULL,
|
|
b int(10) unsigned NOT NULL,
|
|
PRIMARY KEY (a,b),
|
|
KEY b(b)
|
|
);
|
|
|
|
INSERT INTO edges
|
|
VALUES (1,3),(2,1),(2,4),(3,4),(3,5),(3,6),(4,7),(5,1),(5,6),(6,1);
|
|
|
|
DROP TABLE IF EXISTS edges2;
|
|
CREATE VIEW edges2 (a, b) AS
|
|
SELECT a, b FROM edges UNION ALL SELECT b, a FROM edges;
|
|
|
|
--sorted_result
|
|
WITH RECURSIVE transitive_closure(a, b, distance, path_string) AS
|
|
( SELECT a, b, 1 AS distance,
|
|
concat(a, '.', b, '.') AS path_string
|
|
FROM edges
|
|
|
|
UNION ALL
|
|
|
|
SELECT tc.a, e.b, tc.distance + 1,
|
|
concat(tc.path_string, e.b, '.') AS path_string
|
|
FROM edges AS e
|
|
JOIN transitive_closure AS tc
|
|
ON e.a = tc.b
|
|
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
|
|
)
|
|
SELECT * FROM transitive_closure
|
|
ORDER BY a, b, distance;
|
|
|
|
--sorted_result
|
|
WITH RECURSIVE transitive_closure(a, b, distance, path_string) AS
|
|
( SELECT a, b, 1 AS distance,
|
|
concat(a, '.', b, '.') AS path_string
|
|
FROM edges
|
|
WHERE a = 1 -- source
|
|
|
|
UNION ALL
|
|
|
|
SELECT tc.a, e.b, tc.distance + 1,
|
|
concat(tc.path_string, e.b, '.') AS path_string
|
|
FROM edges AS e
|
|
JOIN transitive_closure AS tc ON e.a = tc.b
|
|
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
|
|
)
|
|
SELECT * FROM transitive_closure
|
|
WHERE b = 6 -- destination
|
|
ORDER BY a, b, distance;
|
|
|
|
--sorted_result
|
|
WITH RECURSIVE transitive_closure(a, b, distance, path_string) AS
|
|
( SELECT a, b, 1 AS distance,
|
|
concat(a, '.', b, '.') AS path_string
|
|
FROM edges2
|
|
|
|
UNION ALL
|
|
|
|
SELECT tc.a, e.b, tc.distance + 1,
|
|
concat(tc.path_string, e.b, '.') AS path_string
|
|
FROM edges2 AS e
|
|
JOIN transitive_closure AS tc ON e.a = tc.b
|
|
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
|
|
)
|
|
SELECT * FROM transitive_closure
|
|
ORDER BY a, b, distance;
|
|
|
|
--sorted_result
|
|
WITH RECURSIVE transitive_closure(a, b, distance, path_string)
|
|
AS
|
|
( SELECT a, b, 1 AS distance,
|
|
concat(a, '.', b, '.') AS path_string
|
|
FROM edges2
|
|
|
|
UNION ALL
|
|
|
|
SELECT tc.a, e.b, tc.distance + 1,
|
|
concat(tc.path_string, e.b, '.') AS path_string
|
|
FROM edges2 AS e
|
|
JOIN transitive_closure AS tc ON e.a = tc.b
|
|
WHERE tc.path_string NOT LIKE concat('%', e.b, '.%')
|
|
)
|
|
SELECT a, b, min(distance) AS dist FROM transitive_closure
|
|
GROUP BY a, b
|
|
ORDER BY a, dist, b;
|
|
|
|
DROP VIEW edges2;
|
|
DROP TABLE edges;
|
|
|
|
|
|
--echo #
|
|
--echo # MDEV-11674: recursive CTE table that cannot be stored
|
|
--echo # in a heap table
|
|
--echo #
|
|
|
|
create table t1 (id int, test_data varchar(36));
|
|
|
|
insert into t1(id, test_data)
|
|
select id, test_data
|
|
from (
|
|
with recursive data_generator(id, test_data) as (
|
|
select 1 as id, uuid() as test_data
|
|
union all
|
|
select id + 1, uuid() from data_generator where id < 150000
|
|
)
|
|
select * from data_generator
|
|
) as a;
|
|
|
|
drop table t1;
|
|
|
|
--echo #
|
|
--echo # MDEV-10773: ANALYZE for query with recursive CTE
|
|
--echo #
|
|
|
|
--source include/analyze-format.inc
|
|
analyze format=json
|
|
with recursive src(counter) as
|
|
(select 1
|
|
union
|
|
select counter+1 from src where counter<10
|
|
) select * from src;
|
|
|
|
--echo #
|
|
--echo # mdev-12360: recursive reference in left operand of LEFT JOIN
|
|
--echo #
|
|
|
|
create table folks(id int, name char(32), dob date, father int, mother int);
|
|
|
|
insert into folks values
|
|
(100, 'Me', '2000-01-01', 20, 30),
|
|
(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),
|
|
(25, 'Uncle Jim', '1968-11-18', 8, 7),
|
|
(98, 'Sister Amy', '2001-06-20', 20, 30),
|
|
(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);
|
|
|
|
with recursive
|
|
ancestor_ids (id)
|
|
as
|
|
(
|
|
select father from folks where name = 'Me'
|
|
union
|
|
select mother from folks where name = 'Me'
|
|
union
|
|
select father from ancestor_ids as a left join folks on folks.id = a.id
|
|
union
|
|
select mother from ancestor_ids as a left join folks 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;
|
|
|
|
drop table folks;
|
|
|
|
--echo #
|
|
--echo # mdev-12368: crash with mutually recursive CTE
|
|
--echo # that arenot Standard compliant
|
|
--echo #
|
|
|
|
create table value_nodes (v char(4));
|
|
create table module_nodes(m char(4));
|
|
create table module_arguments(m char(4), v char(4));
|
|
create table module_results(m char(4), v char(4));
|
|
|
|
--ERROR ER_NOT_STANDARD_COMPLIANT_RECURSIVE
|
|
with recursive
|
|
reached_values as
|
|
(
|
|
select v from value_nodes where v in ('v3','v7','v9')
|
|
union
|
|
select module_results.v from module_results, applied_modules
|
|
where module_results.m = applied_modules.m
|
|
),
|
|
applied_modules as
|
|
(
|
|
select module_nodes.m
|
|
from
|
|
module_nodes
|
|
left join
|
|
(
|
|
module_arguments
|
|
left join
|
|
reached_values
|
|
on module_arguments.v = reached_values.v
|
|
)
|
|
on reached_values.v is null and
|
|
module_nodes.m = module_arguments.m
|
|
where module_arguments.m is null
|
|
)
|
|
select * from reached_values;
|
|
|
|
drop table value_nodes, module_nodes, module_arguments, module_results;
|
|
|
|
--echo #
|
|
--echo # mdev-12375: query using one of two mutually recursive CTEs
|
|
--echo # whose non-recursive part returns an empty set
|
|
--echo #
|
|
|
|
create table value_nodes (v char(4));
|
|
insert into value_nodes values
|
|
('v1'), ('v2'), ('v3'), ('v4'), ('v5'), ('v6'), ('v7'), ('v8'), ('v9'),
|
|
('v10'), ('v11'), ('v12'), ('v13'), ('v14'), ('v15'), ('v16');
|
|
create table module_nodes(m char(4));
|
|
insert into module_nodes values
|
|
('m1'), ('m2'), ('m3'), ('m4'), ('m5'), ('m6'), ('m7');
|
|
create table module_arguments(m char(4), v char(4));
|
|
insert into module_arguments values
|
|
('m1','v3'), ('m1','v9'),
|
|
('m2','v4'), ('m2','v3'), ('m2','v7'),
|
|
('m3','v6'),
|
|
('m4','v4'), ('m4','v1'),
|
|
('m5','v10'), ('m5','v8'), ('m5','v3'),
|
|
('m6','v8'), ('m6','v1'),
|
|
('m7','v11'), ('m7','v12');
|
|
create table module_results(m char(4), v char(4));
|
|
insert into module_results values
|
|
('m1','v4'),
|
|
('m2','v1'), ('m2','v6'),
|
|
('m3','v10'),
|
|
('m4','v8'),
|
|
('m5','v11'), ('m5','v9'),
|
|
('m6','v12'), ('m6','v4'),
|
|
('m7','v2');
|
|
|
|
set statement max_recursive_iterations=2, standard_compliant_cte=0 for
|
|
with recursive
|
|
reached_values as
|
|
(
|
|
select v from value_nodes where v in ('v3','v7','v9')
|
|
union
|
|
select module_results.v from module_results, applied_modules
|
|
where module_results.m = applied_modules.m
|
|
),
|
|
applied_modules as
|
|
(
|
|
select * from module_nodes where 1=0
|
|
union
|
|
select module_nodes.m
|
|
from
|
|
module_nodes
|
|
left join
|
|
(
|
|
module_arguments
|
|
left join
|
|
reached_values
|
|
on module_arguments.v = reached_values.v
|
|
)
|
|
on reached_values.v is null and
|
|
module_nodes.m = module_arguments.m
|
|
where module_arguments.m is null
|
|
)
|
|
select * from applied_modules;
|
|
|
|
drop table value_nodes, module_nodes, module_arguments, module_results;
|
|
|
|
--echo #
|
|
--echo # mdev-12519: recursive references in subqueries
|
|
--echo #
|
|
|
|
create table t1 (lp char(4) not null, rp char(4) not null);
|
|
insert into t1 values
|
|
('p1','p2'), ('p2','p3'), ('p3','p4'), ('p4','p5'),
|
|
('p2','p7'), ('p7','p8'), ('p8','p3'), ('p8','p4');
|
|
|
|
set standard_compliant_cte=0;
|
|
|
|
with recursive
|
|
reachables(p) as
|
|
(
|
|
select lp from t1 where lp = 'p1'
|
|
union
|
|
select t1.rp from reachables, t1
|
|
where t1.lp = reachables.p
|
|
)
|
|
select * from reachables;
|
|
|
|
with recursive
|
|
reachables(p) as
|
|
(
|
|
select lp from t1 where lp = 'p1'
|
|
union
|
|
select t1.rp from reachables, t1
|
|
where 'p3' not in (select * from reachables) and
|
|
t1.lp = reachables.p
|
|
)
|
|
select * from reachables;
|
|
|
|
with recursive
|
|
reachables(p) as
|
|
(
|
|
select lp from t1 where lp = 'p1'
|
|
union
|
|
select t1.rp from reachables, t1
|
|
where 'p3' not in (select p from reachables where p <= 'p5'
|
|
union
|
|
select p from reachables where p > 'p5') and
|
|
t1.lp = reachables.p
|
|
)
|
|
select * from reachables;
|
|
|
|
prepare stmt from "
|
|
with recursive
|
|
reachables(p) as
|
|
(
|
|
select lp from t1 where lp = 'p1'
|
|
union
|
|
select t1.rp from reachables, t1
|
|
where 'p3' not in (select p from reachables where p <= 'p5'
|
|
union
|
|
select p from reachables where p > 'p5') and
|
|
t1.lp = reachables.p
|
|
)
|
|
select * from reachables;
|
|
";
|
|
|
|
execute stmt;
|
|
execute stmt;
|
|
|
|
deallocate prepare stmt;
|
|
|
|
drop table t1;
|
|
|
|
create table objects(v char(4) not null);
|
|
insert into objects values
|
|
('v1'), ('v2'), ('v3'), ('v4'), ('v5'),
|
|
('v6'), ('v7'), ('v8'), ('v9'), ('v10');
|
|
|
|
create table modules(m char(4) not null);
|
|
insert into modules values
|
|
('m1'), ('m2'), ('m3'), ('m4');
|
|
|
|
create table module_arguments(m char(4) not null, v char(4) not null);
|
|
insert into module_arguments values
|
|
('m1','v3'), ('m1','v9'),
|
|
('m2','v4'), ('m2','v7'),
|
|
('m3','v6'), ('m4','v2');
|
|
|
|
create table module_results(m char(4) not null, v char(4) not null);
|
|
insert into module_results values
|
|
('m1','v4'),
|
|
('m2','v1'), ('m2','v6'),
|
|
('m3','v10'), ('m4','v7');
|
|
|
|
set standard_compliant_cte=0;
|
|
|
|
with recursive
|
|
reached_objects as
|
|
(
|
|
select v, 'init' as m from objects where v in ('v3','v7','v9')
|
|
union
|
|
select module_results.v, module_results.m from module_results, applied_modules
|
|
where module_results.m = applied_modules.m
|
|
),
|
|
applied_modules as
|
|
(
|
|
select * from modules where 1=0
|
|
union
|
|
select modules.m
|
|
from
|
|
modules
|
|
where
|
|
not exists (select * from module_arguments
|
|
where module_arguments.m = modules.m and
|
|
module_arguments.v not in
|
|
(select v from reached_objects))
|
|
)
|
|
select * from reached_objects;
|
|
|
|
with recursive
|
|
reached_objects as
|
|
(
|
|
select v, 'init' as m from objects where v in ('v3','v7','v9')
|
|
union
|
|
select module_results.v, module_results.m from module_results, applied_modules
|
|
where module_results.m = applied_modules.m
|
|
),
|
|
applied_modules as
|
|
(
|
|
select * from modules where 1=0
|
|
union
|
|
select modules.m
|
|
from
|
|
modules
|
|
where
|
|
'v6' not in (select v from reached_objects) and
|
|
not exists (select * from module_arguments
|
|
where module_arguments.m = modules.m and
|
|
module_arguments.v not in
|
|
(select v from reached_objects))
|
|
)
|
|
select * from reached_objects;
|
|
|
|
prepare stmt from "
|
|
with recursive
|
|
reached_objects as
|
|
(
|
|
select v, 'init' as m from objects where v in ('v3','v7','v9')
|
|
union
|
|
select module_results.v, module_results.m from module_results, applied_modules
|
|
where module_results.m = applied_modules.m
|
|
),
|
|
applied_modules as
|
|
(
|
|
select * from modules where 1=0
|
|
union
|
|
select modules.m
|
|
from
|
|
modules
|
|
where
|
|
'v6' not in (select v from reached_objects) and
|
|
not exists (select * from module_arguments
|
|
where module_arguments.m = modules.m and
|
|
module_arguments.v not in
|
|
(select v from reached_objects))
|
|
)
|
|
select * from reached_objects;
|
|
";
|
|
|
|
execute stmt;
|
|
execute stmt;
|
|
|
|
deallocate prepare stmt;
|
|
|
|
drop table objects, modules, module_arguments, module_results;
|
|
|
|
set standard_compliant_cte=default;
|
|
select @@standard_compliant_cte;
|
|
|
|
--echo #
|
|
--echo # mdev-12554: impossible where in recursive select
|
|
--echo #
|
|
|
|
CREATE TABLE t1 (i int);
|
|
INSERT INTO t1 VALUES (1),(2);
|
|
|
|
WITH RECURSIVE
|
|
cte(f) AS ( SELECT i FROM t1 UNION SELECT f FROM t1, cte WHERE 1=0 )
|
|
SELECT * FROM cte;
|
|
|
|
DROP TABLE t1;
|
|
|
|
--echo #
|
|
--echo # mdev-12556: recursive execution uses Aria temporary tables
|
|
--echo #
|
|
|
|
CREATE TABLE t (c1 varchar(255), c2 tinytext);
|
|
INSERT INTO t VALUES ('a','a'),('b','b'),('c','c'),('d','d');
|
|
|
|
let $q1=
|
|
WITH RECURSIVE cte(f) AS (
|
|
SELECT c1 FROM t
|
|
UNION
|
|
SELECT c1 FROM t, cte
|
|
) SELECT COUNT(*) FROM cte;
|
|
|
|
let $q2=
|
|
WITH RECURSIVE cte(f) AS (
|
|
SELECT c2 FROM t
|
|
UNION
|
|
SELECT c2 FROM t, cte
|
|
) SELECT COUNT(*) FROM cte;
|
|
|
|
eval ANALYZE $q1;
|
|
eval $q1;
|
|
|
|
eval ANALYZE $q2;
|
|
eval $q2;
|
|
|
|
DROP TABLE t;
|
|
|
|
--echo #
|
|
--echo # mdev-12563: no recursive references on the top level of the CTE spec
|
|
--echo #
|
|
|
|
CREATE TABLE t (i int);
|
|
INSERT INTO t VALUES (3), (1),(2);
|
|
|
|
SET standard_compliant_cte=0;
|
|
|
|
WITH RECURSIVE cte(f) AS (
|
|
SELECT i FROM t
|
|
UNION
|
|
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte )
|
|
) SELECT * FROM cte;
|
|
|
|
WITH RECURSIVE cte(f) AS (
|
|
SELECT i FROM t
|
|
UNION
|
|
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte WHERE i < 2 )
|
|
UNION
|
|
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte WHERE i > 2 )
|
|
) SELECT * FROM cte;
|
|
|
|
WITH RECURSIVE cte(f) AS (
|
|
SELECT i FROM t
|
|
UNION
|
|
SELECT i FROM t
|
|
WHERE i NOT IN ( SELECT * FROM cte WHERE i < 2
|
|
UNION
|
|
SELECT * FROM cte WHERE i > 2)
|
|
) SELECT * FROM cte;
|
|
|
|
WITH RECURSIVE cte(f) AS (
|
|
SELECT i FROM t
|
|
UNION
|
|
SELECT i FROM t
|
|
WHERE i NOT IN ( SELECT * FROM t
|
|
WHERE i IN ( SELECT * FROM cte ) GROUP BY i )
|
|
) SELECT * FROM cte;
|
|
|
|
WITH RECURSIVE cte(f) AS (
|
|
SELECT i FROM t
|
|
UNION
|
|
SELECT i FROM t WHERE i NOT IN ( SELECT * FROM cte )
|
|
UNION
|
|
SELECT * FROM cte WHERE f > 2
|
|
) SELECT * FROM cte;
|
|
|
|
set standard_compliant_cte=default;
|
|
|
|
DROP TABLE t;
|
|
|
|
--echo #
|
|
--echo # mdev-14184: recursive CTE embedded into CTE with multiple references
|
|
--echo #
|
|
|
|
WITH
|
|
cte1 AS (
|
|
SELECT n FROM (
|
|
WITH RECURSIVE rec_cte(n) AS (
|
|
SELECT 1 as n1
|
|
UNION ALL
|
|
SELECT n+1 as n2 FROM rec_cte WHERE n < 3
|
|
) SELECT n FROM rec_cte
|
|
) AS X
|
|
),
|
|
cte2 as (
|
|
SELECT 2 FROM cte1
|
|
)
|
|
SELECT *
|
|
FROM cte1;
|
|
|
|
--echo #
|
|
--echo # mdev-14629: a user-defined variable is defined by the recursive CTE
|
|
--echo #
|
|
|
|
set @var=
|
|
(
|
|
with recursive cte_tab(a) as (
|
|
select 1
|
|
union
|
|
select a+1 from cte_tab
|
|
where a<3)
|
|
select count(*) from cte_tab
|
|
);
|
|
|
|
select @var;
|
|
|
|
create table t1(a int, b int);
|
|
insert into t1 values (3,8),(1,5),(5,7),(7,4),(4,3);
|
|
|
|
set @var=
|
|
(
|
|
with recursive summ(a,s) as (
|
|
select 1, 0 union
|
|
select t1.b, t1.b+summ.s from summ, t1
|
|
where summ.a=t1.a)
|
|
select s from summ
|
|
order by a desc
|
|
limit 1
|
|
);
|
|
|
|
select @var;
|
|
|
|
--ERROR ER_UNACCEPTABLE_MUTUAL_RECURSION
|
|
set @var=
|
|
(
|
|
with recursive
|
|
cte_1 as (
|
|
select 1
|
|
union
|
|
select * from cte_2),
|
|
cte_2 as (
|
|
select * from cte_1
|
|
union
|
|
select a from t1, cte_2
|
|
where t1.a=cte_2.a)
|
|
select * from cte_2
|
|
limit 1
|
|
);
|
|
|
|
drop table t1;
|
|
|
|
--echo #
|
|
--echo # mdev-14777: crash caused by the same as in mdev-14755
|
|
--echo #
|
|
|
|
--source include/have_sequence.inc
|
|
|
|
CREATE TABLE t1 (i1 int NOT NULL, i2 int);
|
|
CREATE TABLE t2 (d1 int NOT NULL PRIMARY KEY);
|
|
CREATE TABLE t3 (i int );
|
|
|
|
insert into t1 select seq,seq from seq_1_to_100000;
|
|
insert into t2 select seq from seq_1000_to_100000;
|
|
insert into t3 select seq from seq_1_to_1000;
|
|
|
|
SELECT *
|
|
FROM
|
|
(
|
|
SELECT *
|
|
FROM
|
|
(
|
|
WITH RECURSIVE rt AS
|
|
(
|
|
SELECT i2 P, i1 C FROM t1 WHERE i1 IN (SELECT d1 FROM t2)
|
|
UNION
|
|
SELECT t1.i2 P, rt.C C FROM t1, rt
|
|
)
|
|
SELECT C,P
|
|
FROM ( SELECT P,C FROM rt WHERE NOT EXISTS (SELECT 1 FROM t1) ) Y
|
|
) X
|
|
WHERE 1 = 1
|
|
) K, t3;
|
|
|
|
drop table t1,t2,t3;
|
|
|
|
--echo #
|
|
--echo # mdev-14879: subquery with recursive reference in WHERE of CTE
|
|
--echo #
|
|
|
|
create table flights
|
|
(departure varchar(32),
|
|
arrival varchar(32),
|
|
carrier varchar(20),
|
|
flight_number char(7));
|
|
|
|
insert into flights values
|
|
('Seattle', 'Frankfurt', 'Lufthansa', 'LH 491'),
|
|
('Seattle', 'Chicago', 'American', 'AA 2573'),
|
|
('Seattle', 'Los Angeles', 'Alaska Air', 'AS 410'),
|
|
('Chicago', 'New York', 'American', 'AA 375'),
|
|
('Chicago', 'Montreal', 'Air Canada', 'AC 3053'),
|
|
('Los Angeles', 'New York', 'Delta', 'DL 1197'),
|
|
('Moscow', 'Tokyo', 'Aeroflot', 'SU 264'),
|
|
('New York', 'Paris', 'Air France', 'AF 23'),
|
|
('Frankfurt', 'Moscow', 'Lufthansa', 'LH 1444'),
|
|
('Tokyo', 'Seattle', 'ANA', 'NH 178'),
|
|
('Los Angeles', 'Tokyo', 'ANA', 'NH 175'),
|
|
('Moscow', 'Los Angeles', 'Aeroflot', 'SU 106'),
|
|
('Montreal', 'Paris', 'Air Canada', 'AC 870'),
|
|
('Cairo', 'Paris', 'Air France', 'AF 503'),
|
|
('New York', 'Seattle', 'American', 'AA 45'),
|
|
('Paris', 'Chicago', 'Air France', 'AF 6734');
|
|
|
|
with recursive destinations (city) as
|
|
( select a.arrival from flights a where a.departure='Cairo'
|
|
union
|
|
select b.arrival from destinations r, flights b where r.city=b.departure)
|
|
select * from destinations;
|
|
|
|
set standard_compliant_cte=0;
|
|
|
|
let $q=
|
|
with recursive destinations (city, legs) as
|
|
(
|
|
select a.arrival, 1 from flights a where a.departure='Cairo'
|
|
union
|
|
select b.arrival, r.legs + 1 from destinations r, flights b
|
|
where r.city=b.departure and b.arrival not in (select city from destinations)
|
|
)
|
|
select * from destinations;
|
|
|
|
eval $q;
|
|
eval explain extended $q;
|
|
|
|
set standard_compliant_cte=default;
|
|
|
|
drop table flights;
|
|
|
|
--echo #
|
|
--echo # MDEV-15162: Setting user variable in recursive CTE
|
|
--echo #
|
|
|
|
SET @c=1;
|
|
|
|
WITH RECURSIVE cte AS
|
|
(SELECT 5
|
|
UNION
|
|
SELECT @c:=@c+1 FROM cte WHERE @c<3)
|
|
SELECT * FROM cte;
|
|
|
|
|
|
--echo #
|
|
--echo # MDEV-14217 [db crash] Recursive CTE when SELECT includes new field
|
|
--echo #
|
|
|
|
CREATE TEMPORARY TABLE a_tbl (
|
|
a VARCHAR(33) PRIMARY KEY,
|
|
b VARCHAR(33)
|
|
);
|
|
|
|
INSERT INTO a_tbl VALUES ('block0', 'block0'), ('block1', NULL);
|
|
|
|
--error ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT
|
|
WITH RECURSIVE Q0 AS (
|
|
SELECT T0.a, T0.b, 5
|
|
FROM a_tbl T0
|
|
WHERE b IS NULL
|
|
UNION ALL
|
|
SELECT T1.a, T1.b
|
|
FROM Q0
|
|
JOIN a_tbl T1
|
|
ON T1.a=Q0.a
|
|
) SELECT distinct(Q0.a), Q0.b
|
|
FROM Q0;
|
|
DROP TABLE a_tbl;
|
|
|
|
--error ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT
|
|
WITH RECURSIVE x AS (SELECT 1,2 UNION ALL SELECT 1 FROM x) SELECT * FROM x;
|
|
|
|
--echo #
|
|
--echo # MDEV-15162: Setting user variable in recursive CTE
|
|
--echo #
|
|
|
|
SET @c=1;
|
|
|
|
WITH RECURSIVE cte AS
|
|
(SELECT 5
|
|
UNION
|
|
SELECT @c:=@c+1 FROM cte WHERE @c<3)
|
|
SELECT * FROM cte;
|
|
|
|
--echo #
|
|
--echo # MDEV-14883: recursive references in operands of INTERSECT / EXCEPT
|
|
--echo #
|
|
|
|
create table flights
|
|
(departure varchar(32),
|
|
arrival varchar(32),
|
|
carrier varchar(20),
|
|
flight_number char(7));
|
|
|
|
insert into flights values
|
|
('Seattle', 'Frankfurt', 'Lufthansa', 'LH 491'),
|
|
('Seattle', 'Amsterdam', 'KLM', 'KL 6032'),
|
|
('Seattle', 'Chicago', 'American', 'AA 2573'),
|
|
('Seattle', 'Los Angeles', 'Alaska Air', 'AS 410'),
|
|
('Chicago', 'New York', 'American', 'AA 375'),
|
|
('Chicago', 'Montreal', 'Air Canada', 'AC 3053'),
|
|
('Los Angeles', 'New York', 'Delta', 'DL 1197'),
|
|
('New York', 'London', 'British Airways', 'BA 1511'),
|
|
('London', 'Moscow', 'British Airways', 'BA 233'),
|
|
('Moscow', 'Tokyo', 'Aeroflot', 'SU 264'),
|
|
('Moscow', 'Dubai', 'Emirates', 'EK 2421'),
|
|
('Dubai', 'Tokyo', 'Emirates', 'EK 318'),
|
|
('Dubai', 'Bangkok', 'Emirates', 'EK 2142'),
|
|
('Beijing', 'Bangkok', 'Air China', 'CA 757'),
|
|
('Beijing', 'Tokyo', 'Air China', 'CA 6653'),
|
|
('Moscow', 'Bangkok', 'Aeroflot', 'SU 270'),
|
|
('New York', 'Reykjavik', 'Icelandair', 'FL 416'),
|
|
('New York', 'Paris', 'Air France', 'AF 23'),
|
|
('Amsterdam', 'Moscow', 'KLM', 'KL 903'),
|
|
('Frankfurt', 'Dubai', 'Lufthansa', 'LH 630'),
|
|
('Frankfurt', 'Moscow', 'Lufthansa', 'LH 1444'),
|
|
('Reykjavik', 'London', 'British Airways', 'BA 2229'),
|
|
('Frankfurt', 'Beijing', 'Air China', 'CA 966'),
|
|
('Tokyo', 'Seattle', 'ANA', 'NH 178'),
|
|
('Los Angeles', 'Tokyo', 'ANA', 'NH 175'),
|
|
('Moscow', 'Los Angeles', 'Aeroflot', 'SU 106'),
|
|
('Montreal', 'Paris', 'Air Canada', 'AC 870'),
|
|
('London', 'Delhi', 'British Airways', 'BA 143'),
|
|
('Delhi', 'Bangkok', 'Air India', 'AI 306'),
|
|
('Delhi', 'Dubai', 'Air India', 'AI 995'),
|
|
('Dubai', 'Cairo', 'Emirates', 'EK 927'),
|
|
('Cairo', 'Paris', 'Air France', 'AF 503'),
|
|
('Amsterdam', 'New York', 'Delta', 'DL 47'),
|
|
('New York', 'Seattle', 'American', 'AA 45'),
|
|
('Paris', 'Chicago', 'Air France', 'AF 6734');
|
|
|
|
create table distances
|
|
(city1 varchar(32),
|
|
city2 varchar(32),
|
|
dist int);
|
|
|
|
insert into distances values
|
|
('Seattle', 'Frankfurt', 5080),
|
|
('Seattle', 'Amsterdam', 4859),
|
|
('Seattle', 'Chicago', 1733),
|
|
('Seattle', 'Los Angeles', 960),
|
|
('Chicago', 'New York', 712),
|
|
('Chicago', 'Montreal', 746),
|
|
('Los Angeles', 'New York', 2446),
|
|
('New York', 'London', 3459),
|
|
('London', 'Moscow', 1554),
|
|
('Moscow', 'Tokyo', 4647),
|
|
('Moscow', 'Dubai', 2298),
|
|
('Dubai', 'Tokyo', 4929),
|
|
('Dubai', 'Bangkok', 3050),
|
|
('Beijing', 'Bangkok', 2046),
|
|
('Beijing', 'Tokyo', 1301),
|
|
('Moscow', 'Bangkok', 4390),
|
|
('New York', 'Reykjavik', 2613),
|
|
('New York', 'Paris', 3625),
|
|
('Amsterdam', 'Moscow', 1334),
|
|
('Frankfurt', 'Dubai', 3003),
|
|
('Frankfurt', 'Moscow', 1256),
|
|
('Reykjavik', 'London', 1173),
|
|
('Frankfurt', 'Beijing', 4836),
|
|
('Tokyo', 'Seattle', 4783),
|
|
('Los Angeles', 'Tokyo', 5479),
|
|
('Moscow', 'Los Angeles', 6071),
|
|
('Moscow', 'Reykjavik', 2052),
|
|
('Montreal', 'Paris', 3425),
|
|
('London', 'Delhi', 4159),
|
|
('London', 'Paris', 214),
|
|
('Delhi', 'Bangkok', 1810),
|
|
('Delhi', 'Dubai', 1369),
|
|
('Delhi', 'Beijing', 2350),
|
|
('Dubai', 'Cairo', 1501),
|
|
('Cairo', 'Paris', 1992),
|
|
('Amsterdam', 'New York', 3643),
|
|
('New York', 'Seattle', 2402),
|
|
('Paris', 'Chicago', 4136),
|
|
('Paris', 'Los Angeles', 5647);
|
|
|
|
with recursive destinations (city) as
|
|
(
|
|
select a.arrival from flights a where a.departure = 'Seattle'
|
|
union
|
|
select b.arrival from destinations r, flights b where r.city = b.departure
|
|
)
|
|
select * from destinations;
|
|
|
|
with recursive destinations (city) as
|
|
(
|
|
select a.arrival from flights a, distances d
|
|
where a.departure = 'Seattle' and
|
|
a.departure = d.city1 and a.arrival = d.city2 and
|
|
d.dist < 4000
|
|
union
|
|
select b.arrival from destinations r, flights b, distances d
|
|
where r.city = b.departure and
|
|
b.departure = d.city1 and b.arrival = d.city2 and
|
|
d.dist < 4000
|
|
)
|
|
select * from destinations;
|
|
|
|
set standard_compliant_cte=0;
|
|
|
|
with recursive legs_to_destinations
|
|
(departure, arrival, dist, leg_no, acc_mileage) as
|
|
(
|
|
select a.departure, a.arrival, d.dist, 1, d.dist
|
|
from flights a, distances d
|
|
where a.departure = 'Seattle' and
|
|
a.departure = d.city1 and a.arrival = d.city2 and
|
|
d.dist < 4000
|
|
union all
|
|
select b.departure, b.arrival, d.dist, r.leg_no + 1, r.acc_mileage + d.dist
|
|
from legs_to_destinations r, flights b, distances d
|
|
where r.arrival = b.departure and
|
|
b.departure = d.city1 and b.arrival = d.city2 and
|
|
d.dist < 4000 and
|
|
b.arrival not in (select arrival from legs_to_destinations)
|
|
)
|
|
select * from legs_to_destinations;
|
|
|
|
set standard_compliant_cte=default;
|
|
|
|
with recursive destinations (city) as
|
|
(
|
|
select a.arrival from flights a, distances d
|
|
where a.departure = 'Seattle' and
|
|
a.departure = d.city1 and a.arrival = d.city2 and
|
|
d.dist < 4000
|
|
union
|
|
select b.arrival from destinations r, flights b
|
|
where r.city = b.departure
|
|
intersect
|
|
select city2 from destinations s, distances d
|
|
where s.city = d.city1 and d.dist < 4000
|
|
)
|
|
select * from destinations;
|
|
|
|
with recursive destinations (city) as
|
|
(
|
|
select a.arrival from flights a where a.departure = 'Seattle'
|
|
union
|
|
select * from
|
|
(
|
|
select b.arrival from destinations r, flights b
|
|
where r.city = b.departure
|
|
except
|
|
select arrival from flights
|
|
where arrival in
|
|
('New York', 'London', 'Moscow', 'Dubai', 'Cairo', 'Tokyo')
|
|
) t
|
|
)
|
|
select * from destinations;
|
|
|
|
drop table flights, distances;
|