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MDEV-24975 Server consumes extra 4G memory upon querying INFORMATION_SCHEMA.OPTIIMIZER_TRACE

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if a query used no fields from an I_S table, we were creating a temp
table with one, first, field (as a table cannot have zero fields),
with its length truncated to 1.

Now - force also this dummy field to be a normal field, not a BLOB
This commit is contained in:
Sergei Golubchik 2021-03-07 01:53:52 +01:00
parent f24038b851
commit 01a0d739c8
3 changed files with 23 additions and 0 deletions
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9
mysql-test/main/opt_trace.result
View File

@ -8591,4 +8591,13 @@ JSON_DETAILED(JSON_EXTRACT(trace, '$**.range_scan_alternatives'))
]
DROP TABLE t1;
set optimizer_trace='enabled=off';
#
# MDEV-24975 Server consumes extra 4G memory upon querying INFORMATION_SCHEMA.OPTIIMIZER_TRACE
#
set max_session_mem_used=1024*1024*1024;
select count(*) from information_schema.optimizer_trace;
select * from information_schema.optimizer_trace;
set max_session_mem_used=default;
#
# End of 10.4 tests
#

13
mysql-test/main/opt_trace.test
View File

@ -623,4 +623,17 @@ SELECT JSON_DETAILED(JSON_EXTRACT(trace, '$**.range_scan_alternatives')) from IN
DROP TABLE t1;
set optimizer_trace='enabled=off';
--echo #
--echo # MDEV-24975 Server consumes extra 4G memory upon querying INFORMATION_SCHEMA.OPTIIMIZER_TRACE
--echo #
set max_session_mem_used=1024*1024*1024;
--disable_result_log
select count(*) from information_schema.optimizer_trace;
select * from information_schema.optimizer_trace;
--enable_result_log
set max_session_mem_used=default;
--echo #
--echo # End of 10.4 tests
--echo #

1
sql/sql_show.cc
View File

@ -8767,6 +8767,7 @@ bool optimize_schema_tables_memory_usage(List<TABLE_LIST> &tables)
{
/* all fields were optimized away. Force a non-0-length row */
table->s->reclength= to_recinfo->length= 1;
to_recinfo->type= FIELD_NORMAL;
to_recinfo++;
}
p->recinfo= to_recinfo;