database/mariadb
1
0
Fork 0
mirror of https://github.com/MariaDB/server.git synced 2025-07-30 16:24:05 +03:00
Code Activity

Bug#45567: Fast ALTER TABLE broken for enum and set

Browse Source 
The problem was that appending values to the end of an existing
ENUM or SET column was being treated as table data modification,
preventing a immediately (fast) table alteration that occurs when
only table metadata is being modified.

The cause was twofold: adding a enumeration or set members to the 
end of the list of valid member values was not being considered
a "compatible" table alteration, and for SET columns, the check
was being done upon the max display length and not the underlying
(pack) length of the field.

The solution is to augment the function that checks wether two ENUM
or SET fields are compatible -- by comparing the pack lengths and
performing a limited comparison of the member values.
This commit is contained in:
Davi Arnaut
2009-09-29 07:58:42 -03:00
parent ecc556f492
commit fc3740368a
4 changed files with 174 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

62
mysql-test/r/alter_table.result
View File

@ -1268,4 +1268,66 @@ a b
4 b
5 a
DROP TABLE t1;
#
# Bug#45567: Fast ALTER TABLE broken for enum and set
#
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a ENUM('a1','a2'));
INSERT INTO t1 VALUES ('a1'),('a2');
# No copy: No modification
ALTER TABLE t1 MODIFY COLUMN a ENUM('a1','a2');
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
# No copy: Add new enumeration to the end
ALTER TABLE t1 MODIFY COLUMN a ENUM('a1','a2','a3');
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
# Copy: Modify and add new to the end
ALTER TABLE t1 MODIFY COLUMN a ENUM('a1','a2','xx','a5');
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
# Copy: Remove from the end
ALTER TABLE t1 MODIFY COLUMN a ENUM('a1','a2','xx');
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
# Copy: Add new enumeration
ALTER TABLE t1 MODIFY COLUMN a ENUM('a1','a2','a0','xx');
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
# No copy: Add new enumerations to the end
ALTER TABLE t1 MODIFY COLUMN a ENUM('a1','a2','a0','xx','a5','a6');
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
DROP TABLE t1;
CREATE TABLE t1 (a SET('a1','a2'));
INSERT INTO t1 VALUES ('a1'),('a2');
# No copy: No modification
ALTER TABLE t1 MODIFY COLUMN a SET('a1','a2');
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
# No copy: Add new to the end
ALTER TABLE t1 MODIFY COLUMN a SET('a1','a2','a3');
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
# Copy: Modify and add new to the end
ALTER TABLE t1 MODIFY COLUMN a SET('a1','a2','xx','a5');
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
# Copy: Remove from the end
ALTER TABLE t1 MODIFY COLUMN a SET('a1','a2','xx');
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
# Copy: Add new member
ALTER TABLE t1 MODIFY COLUMN a SET('a1','a2','a0','xx');
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
# No copy: Add new to the end
ALTER TABLE t1 MODIFY COLUMN a SET('a1','a2','a0','xx','a5','a6');
affected rows: 0
info: Records: 0 Duplicates: 0 Warnings: 0
# Copy: Numerical incrase (pack lenght)
ALTER TABLE t1 MODIFY COLUMN a SET('a1','a2','a0','xx','a5','a6','a7','a8','a9','a10');
affected rows: 2
info: Records: 2 Duplicates: 0 Warnings: 0
DROP TABLE t1;
End of 5.1 tests