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Add more tests for hashing and hash-based plans
- Test hashing of an array of a non-hashable element type. - Test UNION [DISTINCT] with hash- and sort-based plans. (Previously, only INTERSECT and EXCEPT where tested there.) - Test UNION [DISTINCT] with a non-hashable column type. This currently reverts to a sort-based plan even if enable_hashagg is on. - Test UNION/INTERSECT/EXCEPT hash- and sort-based plans with arrays as column types. Also test an array with a non-hashable element type. - Test UNION/INTERSECT/EXCEPT similarly with row types as column types. Currently, this uses only sort-based plans because there is no hashing support for row types. - Add a test case that shows that recursive queries using UNION [DISTINCT] require hashable column types. - Add a currently failing test that uses UNION DISTINCT in a cycle-detection use case using row types as column types. Discussion: https://www.postgresql.org/message-id/flat/38eccd35-4e2d-6767-1b3c-dada1eac3124%402ndquadrant.com
This commit is contained in:
Peter Eisentraut
parent
bf0aa7c4b8
commit
6dd8b00807
@ -177,6 +177,13 @@ WHERE hash_array(v)::bit(32) != hash_array_extended(v, 0)::bit(32)
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-------+----------+-----------+-----------
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(0 rows)
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-- array hashing with non-hashable element type
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SELECT v as value, hash_array(v)::bit(32) as standard
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FROM (VALUES ('{0}'::money[])) x(v);
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ERROR: could not identify a hash function for type money
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SELECT v as value, hash_array_extended(v, 0)::bit(32) as extended0
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FROM (VALUES ('{0}'::money[])) x(v);
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ERROR: could not identify an extended hash function for type money
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SELECT v as value, hashbpchar(v)::bit(32) as standard,
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hashbpcharextended(v, 0)::bit(32) as extended0,
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hashbpcharextended(v, 1)::bit(32) as extended1
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@ -345,8 +345,28 @@ ERROR: FOR NO KEY UPDATE is not allowed with UNION/INTERSECT/EXCEPT
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1 | 2 | 3
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(1 row)
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-- exercise both hashed and sorted implementations of INTERSECT/EXCEPT
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-- exercise both hashed and sorted implementations of UNION/INTERSECT/EXCEPT
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set enable_hashagg to on;
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explain (costs off)
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select count(*) from
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( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
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QUERY PLAN
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----------------------------------------------------------------
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Aggregate
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-> HashAggregate
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Group Key: tenk1.unique1
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-> Append
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-> Index Only Scan using tenk1_unique1 on tenk1
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-> Seq Scan on tenk1 tenk1_1
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(6 rows)
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select count(*) from
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( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
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count
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-------
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10000
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(1 row)
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explain (costs off)
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select count(*) from
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( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
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@ -389,6 +409,27 @@ select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
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(1 row)
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set enable_hashagg to off;
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explain (costs off)
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select count(*) from
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( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
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QUERY PLAN
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----------------------------------------------------------------------
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Aggregate
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-> Unique
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-> Sort
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Sort Key: tenk1.unique1
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-> Append
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-> Index Only Scan using tenk1_unique1 on tenk1
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-> Seq Scan on tenk1 tenk1_1
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(7 rows)
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select count(*) from
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( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
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count
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-------
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10000
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(1 row)
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explain (costs off)
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select count(*) from
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( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
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@ -434,6 +475,320 @@ select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
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10
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(1 row)
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reset enable_hashagg;
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-- non-hashable type
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set enable_hashagg to on;
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explain (costs off)
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select x from (values (100::money), (200::money)) _(x) union select x from (values (100::money), (300::money)) _(x);
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QUERY PLAN
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-----------------------------------------------
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Unique
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-> Sort
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Sort Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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set enable_hashagg to off;
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explain (costs off)
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select x from (values (100::money), (200::money)) _(x) union select x from (values (100::money), (300::money)) _(x);
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QUERY PLAN
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-----------------------------------------------
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Unique
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-> Sort
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Sort Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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reset enable_hashagg;
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-- arrays
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set enable_hashagg to on;
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explain (costs off)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
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QUERY PLAN
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-----------------------------------------
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HashAggregate
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Group Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(5 rows)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
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x
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-------
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{1,4}
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{1,2}
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{1,3}
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(3 rows)
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explain (costs off)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
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QUERY PLAN
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-----------------------------------------------
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HashSetOp Intersect
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
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x
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-------
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{1,2}
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(1 row)
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explain (costs off)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
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QUERY PLAN
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-----------------------------------------------
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HashSetOp Except
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
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x
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-------
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{1,3}
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(1 row)
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-- non-hashable type
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explain (costs off)
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select x from (values (array[100::money]), (array[200::money])) _(x) union select x from (values (array[100::money]), (array[300::money])) _(x);
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QUERY PLAN
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-----------------------------------------------
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Unique
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-> Sort
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Sort Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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select x from (values (array[100::money]), (array[200::money])) _(x) union select x from (values (array[100::money]), (array[300::money])) _(x);
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x
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-----------
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{$100.00}
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{$200.00}
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{$300.00}
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(3 rows)
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set enable_hashagg to off;
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explain (costs off)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
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QUERY PLAN
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-----------------------------------------------
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Unique
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-> Sort
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Sort Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
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x
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-------
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{1,2}
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{1,3}
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{1,4}
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(3 rows)
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explain (costs off)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
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QUERY PLAN
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-----------------------------------------------------
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SetOp Intersect
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-> Sort
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Sort Key: "*SELECT* 1".x
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(8 rows)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
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x
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-------
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{1,2}
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(1 row)
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explain (costs off)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
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QUERY PLAN
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-----------------------------------------------------
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SetOp Except
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-> Sort
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Sort Key: "*SELECT* 1".x
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(8 rows)
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select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
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x
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-------
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{1,3}
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(1 row)
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reset enable_hashagg;
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-- records
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set enable_hashagg to on;
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-- currently no hashing support for record, so these will still run with sort plans:
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explain (costs off)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
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QUERY PLAN
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-----------------------------------------------
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Unique
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-> Sort
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Sort Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
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x
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-------
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(1,2)
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(1,3)
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(1,4)
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(3 rows)
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explain (costs off)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
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QUERY PLAN
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-----------------------------------------------------
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SetOp Intersect
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-> Sort
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Sort Key: "*SELECT* 1".x
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(8 rows)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
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x
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-------
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(1,2)
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(1 row)
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explain (costs off)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
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QUERY PLAN
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-----------------------------------------------------
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SetOp Except
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-> Sort
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Sort Key: "*SELECT* 1".x
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(8 rows)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
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x
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-------
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(1,3)
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(1 row)
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-- non-hashable type
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explain (costs off)
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select x from (values (row(100::money)), (row(200::money))) _(x) union select x from (values (row(100::money)), (row(300::money))) _(x);
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QUERY PLAN
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-----------------------------------------------
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Unique
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-> Sort
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Sort Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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select x from (values (row(100::money)), (row(200::money))) _(x) union select x from (values (row(100::money)), (row(300::money))) _(x);
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x
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-----------
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($100.00)
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($200.00)
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($300.00)
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(3 rows)
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set enable_hashagg to off;
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explain (costs off)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
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QUERY PLAN
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-----------------------------------------------
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Unique
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-> Sort
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Sort Key: "*VALUES*".column1
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-> Append
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-> Values Scan on "*VALUES*"
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-> Values Scan on "*VALUES*_1"
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(6 rows)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
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x
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-------
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(1,2)
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(1,3)
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(1,4)
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(3 rows)
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explain (costs off)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
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QUERY PLAN
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-----------------------------------------------------
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SetOp Intersect
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-> Sort
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Sort Key: "*SELECT* 1".x
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(8 rows)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
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x
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-------
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(1,2)
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(1 row)
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explain (costs off)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
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QUERY PLAN
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-----------------------------------------------------
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SetOp Except
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-> Sort
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Sort Key: "*SELECT* 1".x
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-> Append
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-> Subquery Scan on "*SELECT* 1"
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-> Values Scan on "*VALUES*"
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-> Subquery Scan on "*SELECT* 2"
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-> Values Scan on "*VALUES*_1"
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(8 rows)
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select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
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x
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-------
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(1,3)
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(1 row)
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reset enable_hashagg;
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--
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-- Mixed types
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@ -49,6 +49,15 @@ SELECT * FROM t;
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5
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(5 rows)
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-- UNION DISTINCT requires hashable type
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WITH RECURSIVE t(n) AS (
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VALUES (1::money)
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UNION
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SELECT n+1::money FROM t WHERE n < 100::money
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)
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SELECT sum(n) FROM t;
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ERROR: could not implement recursive UNION
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DETAIL: All column datatypes must be hashable.
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-- recursive view
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CREATE RECURSIVE VIEW nums (n) AS
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VALUES (1)
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@ -616,6 +625,17 @@ select * from search_graph;
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2 | 3 | arc 2 -> 3 | f | {"(1,4)","(4,5)","(5,1)","(1,2)","(2,3)"}
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(25 rows)
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-- UNION DISTINCT currently not supported here because row types not hashable
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with recursive search_graph(f, t, label, is_cycle, path) as (
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select *, false, array[row(g.f, g.t)] from graph g
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union distinct
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select g.*, row(g.f, g.t) = any(path), path || row(g.f, g.t)
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from graph g, search_graph sg
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where g.f = sg.t and not is_cycle
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)
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select * from search_graph;
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ERROR: could not implement recursive UNION
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DETAIL: All column datatypes must be hashable.
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-- ordering by the path column has same effect as SEARCH DEPTH FIRST
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with recursive search_graph(f, t, label, is_cycle, path) as (
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select *, false, array[row(g.f, g.t)] from graph g
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@ -130,6 +130,12 @@ FROM (VALUES ('{0}'::int4[]), ('{0,1,2,3,4}'), ('{17,18,19,20}'),
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WHERE hash_array(v)::bit(32) != hash_array_extended(v, 0)::bit(32)
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OR hash_array(v)::bit(32) = hash_array_extended(v, 1)::bit(32);
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|
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-- array hashing with non-hashable element type
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SELECT v as value, hash_array(v)::bit(32) as standard
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FROM (VALUES ('{0}'::money[])) x(v);
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SELECT v as value, hash_array_extended(v, 0)::bit(32) as extended0
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FROM (VALUES ('{0}'::money[])) x(v);
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|
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SELECT v as value, hashbpchar(v)::bit(32) as standard,
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hashbpcharextended(v, 0)::bit(32) as extended0,
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hashbpcharextended(v, 1)::bit(32) as extended1
|
||||
|
||||
@ -118,10 +118,16 @@ SELECT q1 FROM int8_tbl EXCEPT ALL SELECT q1 FROM int8_tbl FOR NO KEY UPDATE;
|
||||
(SELECT 1,2,3 UNION SELECT 4,5,6) EXCEPT SELECT 4,5,6;
|
||||
(SELECT 1,2,3 UNION SELECT 4,5,6 ORDER BY 1,2) EXCEPT SELECT 4,5,6;
|
||||
|
||||
-- exercise both hashed and sorted implementations of INTERSECT/EXCEPT
|
||||
-- exercise both hashed and sorted implementations of UNION/INTERSECT/EXCEPT
|
||||
|
||||
set enable_hashagg to on;
|
||||
|
||||
explain (costs off)
|
||||
select count(*) from
|
||||
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
||||
select count(*) from
|
||||
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
||||
|
||||
explain (costs off)
|
||||
select count(*) from
|
||||
( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
|
||||
@ -134,6 +140,12 @@ select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
|
||||
|
||||
set enable_hashagg to off;
|
||||
|
||||
explain (costs off)
|
||||
select count(*) from
|
||||
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
||||
select count(*) from
|
||||
( select unique1 from tenk1 union select fivethous from tenk1 ) ss;
|
||||
|
||||
explain (costs off)
|
||||
select count(*) from
|
||||
( select unique1 from tenk1 intersect select fivethous from tenk1 ) ss;
|
||||
@ -146,6 +158,84 @@ select unique1 from tenk1 except select unique2 from tenk1 where unique2 != 10;
|
||||
|
||||
reset enable_hashagg;
|
||||
|
||||
-- non-hashable type
|
||||
set enable_hashagg to on;
|
||||
|
||||
explain (costs off)
|
||||
select x from (values (100::money), (200::money)) _(x) union select x from (values (100::money), (300::money)) _(x);
|
||||
|
||||
set enable_hashagg to off;
|
||||
|
||||
explain (costs off)
|
||||
select x from (values (100::money), (200::money)) _(x) union select x from (values (100::money), (300::money)) _(x);
|
||||
|
||||
reset enable_hashagg;
|
||||
|
||||
-- arrays
|
||||
set enable_hashagg to on;
|
||||
|
||||
explain (costs off)
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
|
||||
-- non-hashable type
|
||||
explain (costs off)
|
||||
select x from (values (array[100::money]), (array[200::money])) _(x) union select x from (values (array[100::money]), (array[300::money])) _(x);
|
||||
select x from (values (array[100::money]), (array[200::money])) _(x) union select x from (values (array[100::money]), (array[300::money])) _(x);
|
||||
|
||||
set enable_hashagg to off;
|
||||
|
||||
explain (costs off)
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) union select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) intersect select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
select x from (values (array[1, 2]), (array[1, 3])) _(x) except select x from (values (array[1, 2]), (array[1, 4])) _(x);
|
||||
|
||||
reset enable_hashagg;
|
||||
|
||||
-- records
|
||||
set enable_hashagg to on;
|
||||
|
||||
-- currently no hashing support for record, so these will still run with sort plans:
|
||||
explain (costs off)
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
|
||||
-- non-hashable type
|
||||
explain (costs off)
|
||||
select x from (values (row(100::money)), (row(200::money))) _(x) union select x from (values (row(100::money)), (row(300::money))) _(x);
|
||||
select x from (values (row(100::money)), (row(200::money))) _(x) union select x from (values (row(100::money)), (row(300::money))) _(x);
|
||||
|
||||
set enable_hashagg to off;
|
||||
|
||||
explain (costs off)
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) union select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) intersect select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
explain (costs off)
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
select x from (values (row(1, 2)), (row(1, 3))) _(x) except select x from (values (row(1, 2)), (row(1, 4))) _(x);
|
||||
|
||||
reset enable_hashagg;
|
||||
|
||||
--
|
||||
-- Mixed types
|
||||
--
|
||||
|
||||
@ -31,6 +31,14 @@ UNION ALL
|
||||
)
|
||||
SELECT * FROM t;
|
||||
|
||||
-- UNION DISTINCT requires hashable type
|
||||
WITH RECURSIVE t(n) AS (
|
||||
VALUES (1::money)
|
||||
UNION
|
||||
SELECT n+1::money FROM t WHERE n < 100::money
|
||||
)
|
||||
SELECT sum(n) FROM t;
|
||||
|
||||
-- recursive view
|
||||
CREATE RECURSIVE VIEW nums (n) AS
|
||||
VALUES (1)
|
||||
@ -317,6 +325,16 @@ with recursive search_graph(f, t, label, is_cycle, path) as (
|
||||
)
|
||||
select * from search_graph;
|
||||
|
||||
-- UNION DISTINCT currently not supported here because row types not hashable
|
||||
with recursive search_graph(f, t, label, is_cycle, path) as (
|
||||
select *, false, array[row(g.f, g.t)] from graph g
|
||||
union distinct
|
||||
select g.*, row(g.f, g.t) = any(path), path || row(g.f, g.t)
|
||||
from graph g, search_graph sg
|
||||
where g.f = sg.t and not is_cycle
|
||||
)
|
||||
select * from search_graph;
|
||||
|
||||
-- ordering by the path column has same effect as SEARCH DEPTH FIRST
|
||||
with recursive search_graph(f, t, label, is_cycle, path) as (
|
||||
select *, false, array[row(g.f, g.t)] from graph g
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user