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Bug#16712: group_concat returns odd srting insead of intended result

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when calculating GROUP_CONCAT all blob fields are transformed
  to varchar when making the temp table.
  However a varchar has at max 2 bytes for length. 
  This fix makes the conversion only for blobs whose max length 
  is below that limit. 
  Otherwise blob field is created by make_string_field() call.
This commit is contained in:
gkodinov/kgeorge@macbook.gmz
2006-07-25 11:45:10 +03:00
parent ece5fff44e
commit 9380bb837f
4 changed files with 46 additions and 3 deletions
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14
mysql-test/t/func_gconcat.test
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@@ -433,3 +433,17 @@ create table t1 (c1 varchar(10), c2 int);
select charset(group_concat(c1 order by c2)) from t1;
drop table t1;
#
# Bug #16712: group_concat returns odd string instead of intended result
#
CREATE TABLE t1 (a INT(10), b LONGTEXT, PRIMARY KEY (a));
SET GROUP_CONCAT_MAX_LEN = 20000000;
INSERT INTO t1 VALUES (1,REPEAT(CONCAT('A',CAST(CHAR(0) AS BINARY),'B'), 40000));
INSERT INTO t1 SELECT a + 1, b FROM t1;
SELECT a, CHAR_LENGTH(b) FROM t1;
SELECT CHAR_LENGTH( GROUP_CONCAT(b) ) FROM t1;
SET GROUP_CONCAT_MAX_LEN = 1024;
DROP TABLE t1;