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Fix for bug #8164: subquery with INFORMATION_SCHEMA.COLUMNS, 100 % CPU

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unknown
2005-03-03 19:20:16 +03:00
parent 66d2d13a8e
commit c7fdbffa0d
3 changed files with 20 additions and 0 deletions
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7
mysql-test/r/information_schema.result
View File

@ -631,3 +631,10 @@ TABLES UPDATE_TIME datetime
TABLES CHECK_TIME datetime TABLES CHECK_TIME datetime
ROUTINES CREATED datetime ROUTINES CREATED datetime
ROUTINES LAST_ALTERED datetime ROUTINES LAST_ALTERED datetime
SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES A
WHERE NOT EXISTS
(SELECT * FROM INFORMATION_SCHEMA.COLUMNS B
WHERE A.TABLE_SCHEMA = B.TABLE_SCHEMA
AND A.TABLE_NAME = B.TABLE_NAME);
COUNT(*)
0

9
mysql-test/t/information_schema.test
View File

@ -400,3 +400,12 @@ information_schema.columns
where data_type = 'longtext'; where data_type = 'longtext';
select table_name, column_name, data_type from information_schema.columns select table_name, column_name, data_type from information_schema.columns
where data_type = 'datetime'; where data_type = 'datetime';
#
# Bug #8164 subquery with INFORMATION_SCHEMA.COLUMNS, 100 % CPU
#
SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES A
WHERE NOT EXISTS
(SELECT * FROM INFORMATION_SCHEMA.COLUMNS B
WHERE A.TABLE_SCHEMA = B.TABLE_SCHEMA
AND A.TABLE_NAME = B.TABLE_NAME);

4
sql/sql_show.cc
View File

@ -1649,6 +1649,10 @@ bool uses_only_table_name_fields(Item *item, TABLE_LIST *table)
strlen(item_field->field_name), 0))) strlen(item_field->field_name), 0)))
return 0; return 0;
} }
if (item->type() == Item::SUBSELECT_ITEM &&
!item->const_item())
return 0;
return 1; return 1;
} }