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MDEV-26470 "No database" selected when using CTE in a subquery of DELETE statement

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This bug led to reporting bogus messages "No database selected" for DELETE
statements if they used subqueries in their WHERE conditions and these
subqueries contained references to CTEs.
The bug happened because the grammar rule for DELETE statement did not
call the function LEX::check_cte_dependencies_and_resolve_references() and
as a result of it references to CTEs were not identified as such.

Approved by Oleksandr Byelkin <sanja@mariadb.com>
This commit is contained in:
Igor Babaev 2021-11-20 21:35:54 -08:00
parent 0dae41637a
commit 114e18b8b6
3 changed files with 49 additions and 0 deletions
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22
mysql-test/r/cte_nonrecursive.result
View File

@ -2162,4 +2162,26 @@ a
1
3
drop table t1,t2;
#
# MDEV-26470: CTE in WITH clause of subquery used in DELETE
#
create table t1 (a int);
insert into t1 values (3), (7), (1), (5);
create table t2 (b int);
insert into t2 values (4), (1), (3), (2);
delete from t1
where a in (with cte(a) as (select * from t2 where b <=2) select a from cte);
select * from t1;
a
3
7
5
insert into t1 values (1), (3);
delete t1 from t1, t2
where t1.a=t2.b or
t1.a in (with cte(a) as (select b+1 from t2) select * from cte);
select * from t1;
a
7
drop table t1,t2;
# End of 10.2 tests

23
mysql-test/t/cte_nonrecursive.test
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@ -1601,4 +1601,27 @@ select * from t2;
drop table t1,t2;
--echo #
--echo # MDEV-26470: CTE in WITH clause of subquery used in DELETE
--echo #
create table t1 (a int);
insert into t1 values (3), (7), (1), (5);
create table t2 (b int);
insert into t2 values (4), (1), (3), (2);
delete from t1
where a in (with cte(a) as (select * from t2 where b <=2) select a from cte);
select * from t1;
insert into t1 values (1), (3);
delete t1 from t1, t2
where t1.a=t2.b or
t1.a in (with cte(a) as (select b+1 from t2) select * from cte);
select * from t1;
drop table t1,t2;
--echo # End of 10.2 tests

4
sql/sql_yacc.yy
View File

@ -12668,6 +12668,10 @@ delete:
lex->select_lex.init_order();
}
opt_delete_options single_multi
{
if (Lex->check_cte_dependencies_and_resolve_references())
MYSQL_YYABORT;
}
;
single_multi: