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MDEV-31342: Optimize INFORMATION_SCHEMA.TABLES queries to skip temp table writes #5345

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MDEV-31342: Optimize INFORMATION_SCHEMA.TABLES queries to skip temp table writes #5345

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ce84d0c
MDEV-31342: Optimize INFORMATION_SCHEMA.TABLES queries to skip temp t…
itzanway Jun 22, 2026
049973a
MDEV-31342: revert incidental whitespace, add EXPLAIN coverage and is…
itzanway Jul 10, 2026
a393846
MDEV-31342: Fix CI test failures for I_S fast path EXPLAIN and result…
itzanway Jul 12, 2026
f40735b
MDEV-31342: Fix Tests 11/12 to test OFFSET and SQL_CALC_FOUND_ROWS co…
itzanway Jul 12, 2026
c68991b
MDEV-31342: Fix mdev_31342 for Windows casing and PS protocol builders
itzanway Jul 12, 2026
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4 changes: 2 additions & 2 deletions mysql-test/main/information_schema.result
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Original file line number Diff line number Diff line change
Expand Up @@ -1465,7 +1465,7 @@ id select_type table type possible_keys key key_len ref rows Extra
explain select * from (select table_name from information_schema.tables) as a;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY <derived2> ALL NULL NULL NULL NULL 100
2 DERIVED tables ALL NULL NULL NULL NULL NULL Skip_open_table; Scanned all databases
2 DERIVED tables ALL NULL NULL NULL NULL NULL Skip_open_table; Scanned all databases; I_S fast path
set optimizer_switch=@tmp_optimizer_switch;
drop view v1;
create table t1 (f1 int(11));
Expand Down Expand Up @@ -1739,7 +1739,7 @@ explain select b.table_name
from information_schema.tables a, information_schema.columns b
where a.table_name='t1' and a.table_schema='test' and b.table_name=a.table_name;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE a ALL NULL TABLE_SCHEMA,TABLE_NAME NULL NULL NULL Using where; Skip_open_table; Scanned 0 databases
1 SIMPLE a ALL NULL TABLE_SCHEMA,TABLE_NAME NULL NULL NULL Using where; Skip_open_table; Scanned 0 databases; I_S fast path
1 SIMPLE b ALL NULL NULL NULL NULL NULL Using where; Open_frm_only; Scanned all databases; Using join buffer (flat, BNL join)
SELECT * FROM INFORMATION_SCHEMA.SCHEMATA
WHERE SCHEMA_NAME = 'mysqltest';
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