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Fix bug #12537 UNION produces longtext instead of varchar

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Item::tmp_table_field_from_field_type() and create_tmp_field_from_item()
was converting string field to blob depending on byte-wise length instead of
character length, which results in converting valid varchar string with
length == 86 to longtext.

Made that functions above take into account max width of character when
converting string fields to blobs.
This commit is contained in:
evgen@moonbone.local
2005-08-30 16:19:53 +04:00
parent 6e84ca33d9
commit d76f9471cb
4 changed files with 22 additions and 3 deletions
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7
mysql-test/r/create.result
View File

@ -580,6 +580,13 @@ ERROR 42000: Incorrect database name 'xyz'
create table t1(t1.name int);
create table t2(test.t2.name int);
drop table t1,t2;
CREATE TABLE t1 (f1 VARCHAR(255) CHARACTER SET utf8);
CREATE TABLE t2 AS SELECT LEFT(f1,86) AS f2 FROM t1 UNION SELECT LEFT(f1,86)
AS f2 FROM t1;
DESC t2;
Field Type Null Key Default Extra
f2 varchar(86) YES NULL
DROP TABLE t1,t2;
create database mysqltest;
use mysqltest;
drop database mysqltest;

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

@ -492,6 +492,15 @@ create table t1(t1.name int);
create table t2(test.t2.name int);
drop table t1,t2;
#
# Bug #12537: UNION produces longtext instead of varchar
#
CREATE TABLE t1 (f1 VARCHAR(255) CHARACTER SET utf8);
CREATE TABLE t2 AS SELECT LEFT(f1,86) AS f2 FROM t1 UNION SELECT LEFT(f1,86)
AS f2 FROM t1;
DESC t2;
DROP TABLE t1,t2;
#
# Bug#11028: Crash on create table like
#

6
sql/item.cc
View File

@ -2022,12 +2022,14 @@ Field *Item::tmp_table_field_from_field_type(TABLE *table)
case MYSQL_TYPE_ENUM:
case MYSQL_TYPE_SET:
case MYSQL_TYPE_VAR_STRING:
if (max_length > 255)
DBUG_ASSERT(collation.collation);
if (max_length/collation.collation->mbmaxlen > 255)
break; // If blob
return new Field_varstring(max_length, maybe_null, name, table,
collation.collation);
case MYSQL_TYPE_STRING:
if (max_length > 255) // If blob
DBUG_ASSERT(collation.collation);
if (max_length/collation.collation->mbmaxlen > 255) // If blob
break;
return new Field_string(max_length, maybe_null, name, table,
collation.collation);

3
sql/sql_select.cc
View File

@ -4899,7 +4899,8 @@ static Field* create_tmp_field_from_item(THD *thd, Item *item, TABLE *table,
item->name, table, item->unsigned_flag);
break;
case STRING_RESULT:
if (item->max_length > 255)
DBUG_ASSERT(item->collation.collation);
if (item->max_length/item->collation.collation->mbmaxlen > 255)
{
if (convert_blob_length)
new_field= new Field_varstring(convert_blob_length, maybe_null,