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Bug#39955 SELECT on INFORMATION_SCHEMA.GLOBAL_VARIABLES takes too long

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VARIABLE_VALUE field is decreased to 1024 symbols.
(affected I_S tables: GLOBAL_VARIABLES, SESSION_VARIABLES,
 GLOBAL_STATUS, SESSION_STATUS).
The only variable which can be longer than 1024 is
init_connect. The variable will be truncated with warning.
Additional fix:
Added where condition filter which speed up queries which
have where condition with expressions which use VARIABLE_NAME
field.


mysql-test/r/information_schema.result:
  test result
mysql-test/r/show_check.result:
  result fix
mysql-test/suite/funcs_1/r/is_columns_is.result:
  result fix
mysql-test/t/information_schema.test:
  test case
sql/sql_show.cc:
  VARIABLE_VALUE field is decreased to 1024 symbols.
  (affected I_S tables: GLOBAL_VARIABLES, SESSION_VARIABLES,
   GLOBAL_STATUS, SESSION_STATUS).
  The only variable which can be longer than 1024 is
  init_connect. The variable will be truncated with warning.
  Additional fix:
  Added where condition filter which speed up queries which
  have where condition with expressions which use VARIABLE_NAME
  field.
This commit is contained in:
Sergey Glukhov 2008-11-13 16:09:11 +04:00
commit 53b3052352
5 changed files with 116 additions and 29 deletions
Download patch file Download diff file Expand all files Collapse all files

27
mysql-test/t/information_schema.test
View file

@ -1346,4 +1346,31 @@ explain select count(*) from information_schema.tables;
explain select count(*) from information_schema.columns;
explain select count(*) from information_schema.views;
#
# Bug#39955 SELECT on INFORMATION_SCHEMA.GLOBAL_VARIABLES takes too long
#
set global init_connect="drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;\
drop table if exists t1;drop table if exists t1;";
select * from information_schema.global_variables where variable_name='init_connect';
set global init_connect="";
--echo End of 5.1 tests.