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MDEV-6879: Dereference of NULL primary_file->table in DsMrr_impl::get_disk_sweep_mrr_cost()

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(Attempt #2)
- Don't attempt to use BKA for materialized derived tables. The 
  table is neither filled nor fully opened yet, so attempt to 
  call handler->multi_range_read_info() causes crash.
This commit is contained in:
Sergey Petrunya
2014-10-20 23:35:34 +04:00
parent 8925b4a935
commit 1a996bde1e
3 changed files with 72 additions and 1 deletions
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29
mysql-test/r/derived_opt.result
View File

@ -352,4 +352,33 @@ pk pk
72 72
80 80
drop table t1, t2, t3, t4;
#
# MDEV-6879: Dereference of NULL primary_file->table in DsMrr_impl::get_disk_sweep_mrr_cost()
#
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, b int, c text);
insert into t2
select
A.a + B.a* 10,
A.a + B.a* 10,
'blob-data'
from t1 A, t1 B;
set @tmp_jcl= @@join_cache_level;
set @tmp_os= @@optimizer_switch;
set join_cache_level=6;
set @@optimizer_switch='derived_merge=on,derived_with_keys=on,mrr=on';
explain
select * from
t1 join
(select * from t2 order by a limit 1000) as D1
where
D1.a= t1.a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t1 ALL NULL NULL NULL NULL 10 Using where
1 PRIMARY <derived2> hash_ALL key0 #hash#key0 5 test.t1.a 100 Using join buffer (flat, BNLH join)
2 DERIVED t2 ALL NULL NULL NULL NULL 100 Using filesort
set join_cache_level=@tmp_jcl;
set optimizer_switch=@tmp_os;
drop table t1, t2;
set optimizer_switch=@exit_optimizer_switch;

29
mysql-test/t/derived_opt.test
View File

@ -272,5 +272,34 @@ limit 10;
drop table t1, t2, t3, t4;
--echo #
--echo # MDEV-6879: Dereference of NULL primary_file->table in DsMrr_impl::get_disk_sweep_mrr_cost()
--echo #
create table t1(a int);
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t2 (a int, b int, c text);
insert into t2
select
A.a + B.a* 10,
A.a + B.a* 10,
'blob-data'
from t1 A, t1 B;
set @tmp_jcl= @@join_cache_level;
set @tmp_os= @@optimizer_switch;
set join_cache_level=6;
set @@optimizer_switch='derived_merge=on,derived_with_keys=on,mrr=on';
explain
select * from
t1 join
(select * from t2 order by a limit 1000) as D1
where
D1.a= t1.a;
set join_cache_level=@tmp_jcl;
set optimizer_switch=@tmp_os;
drop table t1, t2;
# The following command must be the last one the file
set optimizer_switch=@exit_optimizer_switch;