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MDEV-30964: MAX_SEL_ARG memory exhaustion is not visible in the optimizer trace

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Sergei Petrunia
2023-03-29 19:42:21 +03:00
parent 2165c30486
commit f5dceafd0b
3 changed files with 81 additions and 0 deletions
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41
mysql-test/main/opt_trace.result
View File

@ -8515,6 +8515,47 @@ SELECT a FROM t1 WHERE (a,b) in (SELECT @c,@d);
a
DROP TABLE t1;
#
# MDEV-30964: MAX_SEL_ARG memory exhaustion is not visible in the optimizer trace
#
create table t1 (
c1 int,
c2 int,
c3 int,
c4 int,
c5 int,
c6 int,
c7 int,
c8 int,
key(c1,c2,c3,c4,c5,c6,c7,c8)
);
insert into t1 () values (),(),();
explain select *
from t1
where
(c1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16) and c2=1) and
c3 in (1,2,3,4,5,6,7,8,9,10) and
c4 in (1,2,3,4,5,6,7,8,9,10) and
c5 in (1,2,3,4,5,6,7,8,9,10) and
c6 in (1,2,3,4);
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index c1 c1 40 NULL 3 Using where; Using index
select
json_detailed(json_extract(trace, '$**.setup_range_conditions'))
from
information_schema.optimizer_trace;
json_detailed(json_extract(trace, '$**.setup_range_conditions'))
[
[
{
"sel_arg_alloc_limit_hit":
{
"alloced_sel_args": 16001
}
}
]
]
drop table t1;
#
# MDEV-31085: multi-update using view with optimizer trace enabled
#
SET SESSION optimizer_trace = 'enabled=on';

33
mysql-test/main/opt_trace.test
View File

@ -677,6 +677,39 @@ INSERT INTO t1 VALUES (0,0);
SELECT a FROM t1 WHERE (a,b) in (SELECT @c,@d);
DROP TABLE t1;
--echo #
--echo # MDEV-30964: MAX_SEL_ARG memory exhaustion is not visible in the optimizer trace
--echo #
create table t1 (
c1 int,
c2 int,
c3 int,
c4 int,
c5 int,
c6 int,
c7 int,
c8 int,
key(c1,c2,c3,c4,c5,c6,c7,c8)
);
insert into t1 () values (),(),();
explain select *
from t1
where
(c1 in (1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16) and c2=1) and
c3 in (1,2,3,4,5,6,7,8,9,10) and
c4 in (1,2,3,4,5,6,7,8,9,10) and
c5 in (1,2,3,4,5,6,7,8,9,10) and
c6 in (1,2,3,4);
select
json_detailed(json_extract(trace, '$**.setup_range_conditions'))
from
information_schema.optimizer_trace;
drop table t1;
--echo #
--echo # MDEV-31085: multi-update using view with optimizer trace enabled
--echo #

7
sql/opt_range.cc
View File

@ -2853,6 +2853,13 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
Json_writer_array trace_range_summary(thd,
"setup_range_conditions");
tree= cond->get_mm_tree(&param, &cond);
if (thd->trace_started() &&
param.alloced_sel_args >= SEL_ARG::MAX_SEL_ARGS)
{
Json_writer_object wrapper(thd);
Json_writer_object obj(thd, "sel_arg_alloc_limit_hit");
obj.add("alloced_sel_args", param.alloced_sel_args);
}
}
if (tree)
{