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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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13
mysql-test/main/opt_trace.test
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@@ -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 #