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MDEV-240: SHOW EXPLAIN: Assertion `this->optimized == 2' failed

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- Fix the bug: SHOW EXPLAIN may hit a case where a join is partially 
  optimized.
- Change JOIN::optimized to use enum instead of numeric constants
This commit is contained in:
Sergey Petrunya
2012-05-11 18:13:06 +04:00
parent 6fae4447f0
commit 6bce336624
6 changed files with 80 additions and 11 deletions
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33
mysql-test/r/show_explain.result
View File

@ -1,4 +1,5 @@
drop table if exists t0, t1, t2;
drop view if exists v1;
create table t0 (a int);
insert into t0 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
create table t1 (a int);
@ -337,4 +338,36 @@ Warnings:
Note 1003 select `test`.`t2`.`a` AS `a` from `test`.`t2` join `test`.`t2` group by `test`.`t2`.`a`
set debug='';
DROP TABLE t2;
#
# MDEV-240: SHOW EXPLAIN: Assertion `this->optimized == 2' failed in
# JOIN::print_explain on query with a JOIN, TEMPTABLE view,
#
CREATE TABLE t3 (a INT);
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t3;
INSERT INTO t3 VALUES (8);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5),(6),(7),(8),(9);
explain SELECT * FROM v1, t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> system NULL NULL NULL NULL 1
1 PRIMARY t2 ALL NULL NULL NULL NULL 6
2 DERIVED t3 system NULL NULL NULL NULL 1
set @show_explain_probe_select_id=2;
set debug='d,show_explain_probe_join_exec_end';
SELECT * FROM v1, t2;
show explain for $thr2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY NULL NULL NULL NULL NULL NULL NULL Not yet optimized
Warnings:
Note 1003 SELECT * FROM v1, t2
a b
8 4
8 5
8 6
8 7
8 8
8 9
set debug='';
DROP VIEW v1;
DROP TABLE t2, t3;
drop table t0,t1;

25
mysql-test/t/show_explain.test
View File

@ -5,6 +5,7 @@
--disable_warnings
drop table if exists t0, t1, t2;
drop view if exists v1;
--enable_warnings
#
@ -346,6 +347,30 @@ set debug='';
DROP TABLE t2;
--echo #
--echo # MDEV-240: SHOW EXPLAIN: Assertion `this->optimized == 2' failed in
--echo # JOIN::print_explain on query with a JOIN, TEMPTABLE view,
--echo #
CREATE TABLE t3 (a INT);
CREATE ALGORITHM=TEMPTABLE VIEW v1 AS SELECT * FROM t3;
INSERT INTO t3 VALUES (8);
CREATE TABLE t2 (b INT);
INSERT INTO t2 VALUES (4),(5),(6),(7),(8),(9);
explain SELECT * FROM v1, t2;
set @show_explain_probe_select_id=2;
set debug='d,show_explain_probe_join_exec_end';
send SELECT * FROM v1, t2;
connection default;
--source include/wait_condition.inc
evalp show explain for $thr2;
connection con1;
reap;
set debug='';
DROP VIEW v1;
DROP TABLE t2, t3;
## TODO: Test this: have several SHOW EXPLAIN requests be queued up for a
## thread and served together.