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Fixed bug mdev-10889

Browse Source 
The bug was in the code of the recursive method
With_element::check_unrestricted_recursive. For recursive
calls of this method sel->get_with_element()->owner != owner.
This commit is contained in:
Igor Babaev
2016-09-26 10:40:44 -07:00
parent 1f1990a161
commit b91bd822fa
3 changed files with 71 additions and 2 deletions
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37
mysql-test/r/cte_recursive.result
View File

@ -1769,3 +1769,40 @@ WITH RECURSIVE cte(f) AS
SELECT * FROM cte as t;
f
DROP TABLE t1;
#
# MDEV-10889: mergeable derived in the spec of recursive CTE
#
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;
a
3
4
5
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;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 5
2 SUBQUERY t2 ALL NULL NULL NULL NULL 5 Using where
4 RECURSIVE UNION <derived2> ALL NULL NULL NULL NULL 5
4 RECURSIVE UNION t2 ALL NULL NULL NULL NULL 5 Using where; Using join buffer (flat, BNL join)
NULL UNION RESULT <union2,4> ALL NULL NULL NULL NULL NULL
drop table t1,t2;

32
mysql-test/t/cte_recursive.test
View File

@ -1304,3 +1304,35 @@ 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-10889: 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;

4
sql/sql_cte.cc
View File

@ -1106,7 +1106,7 @@ bool With_element::check_unrestricted_recursive(st_select_lex *sel,
table_map &unrestricted,
table_map &encountered)
{
/* Check conditions 1-for restricted specification*/
/* Check conditions 1 for restricted specification*/
List_iterator<TABLE_LIST> ti(sel->leaf_tables);
TABLE_LIST *tbl;
while ((tbl= ti++))
@ -1141,7 +1141,7 @@ bool With_element::check_unrestricted_recursive(st_select_lex *sel,
encountered|= with_elem->get_elem_map();
}
}
for (With_element *with_elem= sel->get_with_element()->owner->with_list.first;
for (With_element *with_elem= owner->with_list.first;
with_elem;
with_elem= with_elem->next)
{