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Bug#31291 ALTER TABLE CONVERT TO CHARACTER SET does not change some data types

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added ability for TINY[MEDIUM] text fields 
to be converted to greater subtype during
alter if necessary(altered charset)
This commit is contained in:
Sergey Glukhov 2008-12-09 16:38:52 +04:00
parent 904c7c4409
commit d2b5e0bb94
3 changed files with 32 additions and 1 deletions
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16
mysql-test/r/alter_table.result
View file

@ -915,3 +915,19 @@ check table t1;
Table Op Msg_type Msg_text
test.t1 check status OK
drop table t1;
create table t1 (a tinytext character set latin1);
alter table t1 convert to character set utf8;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` text
) ENGINE=MyISAM DEFAULT CHARSET=utf8
drop table t1;
create table t1 (a mediumtext character set latin1);
alter table t1 convert to character set utf8;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`a` longtext
) ENGINE=MyISAM DEFAULT CHARSET=utf8
drop table t1;

13
mysql-test/t/alter_table.test
View file

@ -696,3 +696,16 @@ unlock tables;
select * from t1;
check table t1;
drop table t1;
#
# Bug#31291 ALTER TABLE CONVERT TO CHARACTER SET does not change some data types
#
create table t1 (a tinytext character set latin1);
alter table t1 convert to character set utf8;
show create table t1;
drop table t1;
create table t1 (a mediumtext character set latin1);
alter table t1 convert to character set utf8;
show create table t1;
drop table t1;

4
sql/sql_table.cc
View file

@ -1535,7 +1535,9 @@ static bool prepare_blob_field(THD *thd, create_field *sql_field)
if ((sql_field->flags & BLOB_FLAG) && sql_field->length)
{
if (sql_field->sql_type == FIELD_TYPE_BLOB)
if (sql_field->sql_type == FIELD_TYPE_BLOB ||
sql_field->sql_type == FIELD_TYPE_TINY_BLOB ||
sql_field->sql_type == FIELD_TYPE_MEDIUM_BLOB)
{
/* The user has given a length to the blob column */
sql_field->sql_type= get_blob_type_from_length(sql_field->length);