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Fixed numerous problems for mutually recursive CTE.
Actually mutually recursive CTE were not functional. Now the code for mutually recursive CTE looks like functional, but still needs re-writing. Added many new test cases for mutually recursive CTE.
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8 files changed

+653
-32
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‎mysql-test/r/cte_recursive.result

Lines changed: 250 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -372,9 +372,9 @@ id name dob father mother
372372
100 Me 2000-01-01 20 30
373373
20 Dad 1970-02-02 10 9
374374
30 Mom 1975-03-03 8 7
375-
9 Grandma Ann 1941-10-15 NULL NULL
376375
10 Grandpa Bill 1940-04-05 NULL NULL
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8 Grandpa Ben 1940-10-21 NULL NULL
377+
9 Grandma Ann 1941-10-15 NULL NULL
378378
7 Grandma Sally 1943-08-23 NULL 6
379379
6 Grandgrandma Martha 1923-05-17 NULL NULL
380380
with recursive
@@ -406,6 +406,254 @@ h_name h_dob w_name w_dob
406406
Dad 1970-02-02 Mom 1975-03-03
407407
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
408408
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
409+
with recursive
410+
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
411+
w_id, w_name, w_dob, w_father, w_mother)
412+
as
413+
(
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select h.*, w.*
415+
from folks h, folks w, coupled_ancestors a
416+
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
421+
(v.father = h.id AND v.mother= w.id)
422+
),
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coupled_ancestors (id, name, dob, father, mother)
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as
425+
(
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select h_id, h_name, h_dob, h_father, h_mother
427+
from ancestor_couples
428+
union all
429+
select w_id, w_name, w_dob, w_father, w_mother
430+
from ancestor_couples
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)
432+
select h_name, h_dob, w_name, w_dob
433+
from ancestor_couples;
434+
h_name h_dob w_name w_dob
435+
Dad 1970-02-02 Mom 1975-03-03
436+
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
437+
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
438+
with recursive
439+
ancestor_couples(h_id, h_name, h_dob, h_father, h_mother,
440+
w_id, w_name, w_dob, w_father, w_mother)
441+
as
442+
(
443+
select h.*, w.*
444+
from folks h, folks w, coupled_ancestors a
445+
where a.father = h.id AND a.mother = w.id
446+
),
447+
coupled_ancestors (id, name, dob, father, mother)
448+
as
449+
(
450+
select *
451+
from folks
452+
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
458+
from ancestor_couples
459+
)
460+
select h_name, h_dob, w_name, w_dob
461+
from ancestor_couples;
462+
h_name h_dob w_name w_dob
463+
Dad 1970-02-02 Mom 1975-03-03
464+
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
465+
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
466+
with recursive
467+
ancestor_couple_ids(h_id, w_id)
468+
as
469+
(
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select a.father, a.mother
471+
from coupled_ancestors a
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where a.father is not null and a.mother is not null
473+
),
474+
coupled_ancestors (id, name, dob, father, mother)
475+
as
476+
(
477+
select *
478+
from folks
479+
where name = 'Me'
480+
union all
481+
select p.*
482+
from folks p, ancestor_couple_ids fa
483+
where p.id = fa.h_id
484+
union all
485+
select p.*
486+
from folks p, ancestor_couple_ids ma
487+
where p.id = ma.w_id
488+
)
489+
select *
490+
from ancestor_couple_ids;
491+
h_id w_id
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20 30
493+
10 9
494+
8 7
495+
with recursive
496+
ancestor_couple_ids(h_id, w_id)
497+
as
498+
(
499+
select a.father, a.mother
500+
from coupled_ancestors a
501+
where a.father is not null and a.mother is not null
502+
),
503+
coupled_ancestors (id, name, dob, father, mother)
504+
as
505+
(
506+
select *
507+
from folks
508+
where name = 'Me'
509+
union all
510+
select p.*
511+
from folks p, ancestor_couple_ids fa
512+
where p.id = fa.h_id
513+
union all
514+
select p.*
515+
from folks p, ancestor_couple_ids ma
516+
where p.id = ma.w_id
517+
)
518+
select h.name, h.dob, w.name, w.dob
519+
from ancestor_couple_ids c, folks h, folks w
520+
where c.h_id = h.id and c.w_id= w.id;
521+
name dob name dob
522+
Dad 1970-02-02 Mom 1975-03-03
523+
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
524+
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
525+
with recursive
526+
ancestor_couple_ids(h_id, w_id)
527+
as
528+
(
529+
select a.father, a.mother
530+
from coupled_ancestors a
531+
where a.father is not null and a.mother is not null
532+
),
533+
coupled_ancestors (id, name, dob, father, mother)
534+
as
535+
(
536+
select *
537+
from folks
538+
where name = 'Me'
539+
union all
540+
select p.*
541+
from folks p, ancestor_couple_ids fa
542+
where p.id = fa.h_id
543+
union all
544+
select p.*
545+
from folks p, ancestor_couple_ids ma
546+
where p.id = ma.w_id
547+
)
548+
select h.name, h.dob, w.name, w.dob
549+
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
550+
where c.h_id = h.id and c.w_id= w.id;
551+
name dob name dob
552+
Dad 1970-02-02 Mom 1975-03-03
553+
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
554+
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
555+
explain extended
556+
with recursive
557+
ancestor_couple_ids(h_id, w_id)
558+
as
559+
(
560+
select a.father, a.mother
561+
from coupled_ancestors a
562+
where a.father is not null and a.mother is not null
563+
),
564+
coupled_ancestors (id, name, dob, father, mother)
565+
as
566+
(
567+
select *
568+
from folks
569+
where name = 'Me'
570+
union all
571+
select p.*
572+
from folks p, ancestor_couple_ids fa
573+
where p.id = fa.h_id
574+
union all
575+
select p.*
576+
from folks p, ancestor_couple_ids ma
577+
where p.id = ma.w_id
578+
)
579+
select h.name, h.dob, w.name, w.dob
580+
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
581+
where c.h_id = h.id and c.w_id= w.id;
582+
id select_type table type possible_keys key key_len ref rows filtered Extra
583+
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 36 100.00
584+
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 468 100.00 Using where; Using join buffer (flat, BNL join)
585+
1 PRIMARY <derived3> ALL NULL NULL NULL NULL 468 100.00 Using where; Using join buffer (incremental, BNL join)
586+
3 SUBQUERY folks ALL NULL NULL NULL NULL 12 100.00 Using where
587+
4 UNCACHEABLE UNION p ALL NULL NULL NULL NULL 12 100.00
588+
4 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 36 100.00 Using where; Using join buffer (flat, BNL join)
589+
5 UNCACHEABLE UNION <derived2> ALL NULL NULL NULL NULL 2 100.00
590+
5 UNCACHEABLE UNION p ALL NULL NULL NULL NULL 12 100.00 Using where; Using join buffer (flat, BNL join)
591+
NULL UNION RESULT <union3,4,5> ALL NULL NULL NULL NULL NULL NULL
592+
2 UNCACHEABLE SUBQUERY <derived3> ALL NULL NULL NULL NULL 36 100.00 Using where
593+
Warnings:
594+
Note 1003 with recursive ancestor_couple_ids as (select `a`.`father` AS `h_id`,`a`.`mother` AS `w_id` from `coupled_ancestors` `a` where ((`a`.`father` is not null) and (`a`.`mother` is not null)))coupled_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` = 'Me') union all select `test`.`p`.`id` AS `id`,`test`.`p`.`name` AS `name`,`test`.`p`.`dob` AS `dob`,`test`.`p`.`father` AS `father`,`test`.`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestor_couple_ids` `fa` where (`fa`.`h_id` = `test`.`p`.`id`) union all select `test`.`p`.`id` AS `id`,`test`.`p`.`name` AS `name`,`test`.`p`.`dob` AS `dob`,`test`.`p`.`father` AS `father`,`test`.`p`.`mother` AS `mother` from `test`.`folks` `p` join `ancestor_couple_ids` `ma` where (`test`.`p`.`id` = `ma`.`w_id`)), select `h`.`name` AS `name`,`h`.`dob` AS `dob`,`w`.`name` AS `name`,`w`.`dob` AS `dob` from `ancestor_couple_ids` `c` join `coupled_ancestors` `h` join `coupled_ancestors` `w` where ((`h`.`id` = `c`.`h_id`) and (`w`.`id` = `c`.`w_id`))
595+
with recursive
596+
ancestor_couple_ids(h_id, w_id)
597+
as
598+
(
599+
select a.father, a.mother
600+
from coupled_ancestors a
601+
),
602+
coupled_ancestors (id, name, dob, father, mother)
603+
as
604+
(
605+
select *
606+
from folks
607+
where name = 'Me'
608+
union all
609+
select p.*
610+
from folks p, ancestor_couple_ids fa
611+
where p.id = fa.h_id
612+
union all
613+
select p.*
614+
from folks p, ancestor_couple_ids ma
615+
where p.id = ma.w_id
616+
)
617+
select *
618+
from ancestor_couple_ids;
619+
h_id w_id
620+
20 30
621+
10 9
622+
8 7
623+
NULL NULL
624+
NULL NULL
625+
NULL NULL
626+
NULL 6
627+
NULL NULL
628+
with recursive
629+
ancestor_couple_ids(h_id, w_id)
630+
as
631+
(
632+
select a.father, a.mother
633+
from coupled_ancestors a
634+
),
635+
coupled_ancestors (id, name, dob, father, mother)
636+
as
637+
(
638+
select *
639+
from folks
640+
where name = 'Me'
641+
union all
642+
select p.*
643+
from folks p, ancestor_couple_ids fa
644+
where p.id = fa.h_id
645+
union all
646+
select p.*
647+
from folks p, ancestor_couple_ids ma
648+
where p.id = ma.w_id
649+
)
650+
select h.name, h.dob, w.name, w.dob
651+
from ancestor_couple_ids c, coupled_ancestors h, coupled_ancestors w
652+
where c.h_id = h.id and c.w_id= w.id;
653+
name dob name dob
654+
Dad 1970-02-02 Mom 1975-03-03
655+
Grandpa Bill 1940-04-05 Grandma Ann 1941-10-15
656+
Grandpa Ben 1940-10-21 Grandma Sally 1943-08-23
409657
prepare stmt1 from "
410658
with recursive
411659
ancestors
@@ -495,9 +743,9 @@ id name dob father mother
495743
100 Me 2000-01-01 20 30
496744
20 Dad 1970-02-02 10 9
497745
30 Mom 1975-03-03 8 7
498-
9 Grandma Ann 1941-10-15 NULL NULL
499746
10 Grandpa Bill 1940-04-05 NULL NULL
500747
8 Grandpa Ben 1940-10-21 NULL NULL
748+
9 Grandma Ann 1941-10-15 NULL NULL
501749
7 Grandma Sally 1943-08-23 NULL 6
502750
6 Grandgrandma Martha 1923-05-17 NULL NULL
503751
drop view v1,v2;
@@ -571,7 +819,6 @@ id name dob father mother
571819
100 Me 2000-01-01 20 30
572820
20 Dad 1970-02-02 10 9
573821
30 Mom 1975-03-03 8 7
574-
9 Grandma Ann 1941-10-15 NULL NULL
575822
10 Grandpa Bill 1940-04-05 NULL NULL
576823
8 Grandpa Ben 1940-10-21 NULL NULL
577824
9 Grandma Ann 1941-10-15 NULL NULL

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