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Code Activity

MDEV-5602: CREATE OR REPLACE obtains stricter locks than the connection had before

Browse Source 
mysql-test/r/create_or_replace.result:
  Added test case
mysql-test/t/create_or_replace.test:
  Added test case
sql/sql_base.cc:
  Downgrade locks in LOCK TABLES + CREATE TABLE OR REPLACE
sql/sql_table.cc:
  Downgrade locks in LOCK TABLES + CREATE TABLE OR REPLACE
This commit is contained in:
Michael Widenius
2014-02-05 21:36:16 +02:00
parent 0557de84f1
commit 1695fc4532
6 changed files with 85 additions and 9 deletions
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35
mysql-test/r/create_or_replace.result
View File

@@ -324,4 +324,39 @@ ERROR 42S02: 'test.t1' is a view
drop table t1;
ERROR 42S02: 'test.t1' is a view
drop view t1;
#
# MDEV-5602 CREATE OR REPLACE obtains stricter locks than the
# connection had before
#
create table t1 (a int);
lock table t1 write, t2 read;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Global read lock
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE MDL_EXPLICIT Table metadata lock test t1
# MDL_SHARED_READ MDL_EXPLICIT Table metadata lock test t2
create or replace table t1 (i int);
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Global read lock
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE MDL_EXPLICIT Table metadata lock test t1
# MDL_SHARED_READ MDL_EXPLICIT Table metadata lock test t2
create or replace table t1 like t2;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Global read lock
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE MDL_EXPLICIT Table metadata lock test t1
# MDL_SHARED_READ MDL_EXPLICIT Table metadata lock test t2
create or replace table t1 select 1 as f1;
select * from information_schema.metadata_lock_info;
THREAD_ID LOCK_MODE LOCK_DURATION LOCK_TYPE TABLE_SCHEMA TABLE_NAME
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Global read lock
# MDL_INTENTION_EXCLUSIVE MDL_EXPLICIT Schema metadata lock test
# MDL_SHARED_NO_READ_WRITE MDL_EXPLICIT Table metadata lock test t1
# MDL_SHARED_READ MDL_EXPLICIT Table metadata lock test t2
drop table t1;
unlock tables;
DROP TABLE t2;