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23 lines
1005 B
Plaintext
23 lines
1005 B
Plaintext
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#
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# MDEV-4029 SELECT on information_schema using a subquery locks up the information_schema table due to incorrect mutexes handling
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#
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select variable_name from information_schema.session_status where variable_name =
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(select variable_name from information_schema.session_status where variable_name = 'uptime');
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select variable_name from information_schema.session_variables where variable_name =
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(select variable_name from information_schema.session_variables where variable_name = 'basedir');
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#
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# information_schema tables inside subqueries, they should not be re-populated
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# (i_s.columns needs to scan i_s itself, creating a tmp table for every i_s
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# table. if it's re-populated, it'll do that multiple times)
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#
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create table t1 (a char);
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insert t1 values ('a'),('t'),('z');
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flush status;
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select a, exists (select 1 from information_schema.columns where table_schema=concat('tes',a)) from t1;
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# fix the result in ps-protocol
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--replace_result 44 43
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show status like 'created_tmp_tables';
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drop table t1;
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