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MDEV-21028 Server crashes in Query_arena::set_query_arena upon SELECT from view

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if the view has algorithm=temptable it is not updatable,
so DEFAULT() for its fields is meaningless,
and thus it's NULL or 0/'' for NOT NULL columns.
This commit is contained in:
Sergei Golubchik 2022-04-19 17:09:19 +02:00
parent 9c5fd0f624
commit 5ba77222e9
3 changed files with 71 additions and 1 deletions
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43
mysql-test/r/func_default.result
View file

@ -159,5 +159,48 @@ a
10
DROP TABLE t1;
#
# MDEV-21028 Server crashes in Query_arena::set_query_arena upon SELECT from view
#
create table t1 (a datetime default current_timestamp);
insert into t1 () values (),();
create algorithm=temptable view v1 as select * from t1;
create algorithm=merge view v2 as select * from t1;
select default(a) = now() from v1;
default(a) = now()
NULL
NULL
select default(a) = now() from v2;
default(a) = now()
1
1
select table_name,is_updatable from information_schema.views;
table_name is_updatable
v1 NO
v2 YES
drop view v1, v2;
drop table t1;
create table t1 (v1 timestamp) select 'x';
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`v1` timestamp NOT NULL DEFAULT current_timestamp() ON UPDATE current_timestamp(),
`x` varchar(1) NOT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
select default(v1) from (select v1 from t1) dt;
default(v1)
2001-01-01 10:20:30
select default(v1) from (select v1 from t1 group by v1) dt;
default(v1)
0000-00-00 00:00:00
drop table t1;
create table t1 (a text default '');
create algorithm=temptable view v1 as select * from t1;
insert into t1 values ('a');
select default(a) from v1;
default(a)
NULL
drop view v1;
drop table t1;
#
# End of 10.2 tests
#

26
mysql-test/t/func_default.test
View file

@ -139,6 +139,32 @@ FROM t1;
SELECT a FROM t1 WHERE CASE WHEN a THEN DEFAULT(a) END IS FALSE;
DROP TABLE t1;
--echo #
--echo # MDEV-21028 Server crashes in Query_arena::set_query_arena upon SELECT from view
--echo #
create table t1 (a datetime default current_timestamp);
insert into t1 () values (),();
create algorithm=temptable view v1 as select * from t1;
create algorithm=merge view v2 as select * from t1;
select default(a) = now() from v1;
select default(a) = now() from v2;
select table_name,is_updatable from information_schema.views;
drop view v1, v2;
drop table t1;
create table t1 (v1 timestamp) select 'x';
show create table t1;
select default(v1) from (select v1 from t1) dt;
select default(v1) from (select v1 from t1 group by v1) dt;
drop table t1;
create table t1 (a text default '');
create algorithm=temptable view v1 as select * from t1;
insert into t1 values ('a');
select default(a) from v1;
drop view v1;
drop table t1;
--echo #
--echo # End of 10.2 tests
--echo #

3
sql/sql_select.cc
View file

@ -16333,7 +16333,8 @@ Field *create_tmp_field_from_field(THD *thd, Field *org_field,
table->s->db_create_options|= HA_OPTION_PACK_RECORD;
else if (org_field->type() == FIELD_TYPE_DOUBLE)
((Field_double *) new_field)->not_fixed= TRUE;
new_field->vcol_info= 0;
new_field->vcol_info= new_field->default_value=
new_field->check_constraint= 0;
new_field->cond_selectivity= 1.0;
new_field->next_equal_field= NULL;
new_field->option_list= NULL;