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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.


sql/item.cc:
  Fix bug #12537 UNION produces longtext instead of varchar
  Item::tmp_table_field_from_field_type() now taking into account max char width when creating tmp field for string fields.
sql/sql_select.cc:
  Fix bug #12537 UNION produces longtext instead of varchar
   create_tmp_field_from_item()now taking into account max char width when creating tmp field for string fields.
mysql-test/r/create.result:
  Test case for bug #12537 UNION produces longtext instead of varchar
mysql-test/t/create.test:
  Test case for bug #12537 UNION produces longtext instead of varchar
This commit is contained in:
unknown
2005-08-30 16:19:53 +04:00
parent 67d94b1c44
commit 033faf7256
4 changed files with 22 additions and 3 deletions
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7
mysql-test/r/create.result
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@ -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;