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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.


mysql-test/r/func_gconcat.result:
  Bug#16712: group_concat returns odd srting insead of intended result
    * testsuite for the bug
mysql-test/t/func_gconcat.test:
  Bug#16712: group_concat returns odd srting insead of intended result
    * testsuite for the bug
sql/item_sum.cc:
  Bug#16712: group_concat returns odd srting insead of intended result
    * force blob->varchar conversion for small enough blobs only
sql/sql_select.cc:
  Bug#16712: group_concat returns odd srting insead of intended result
    * force blob->varchar conversion for small enough blobs only
This commit is contained in:
unknown 2006-07-25 11:45:10 +03:00
commit 4e7121c07b
4 changed files with 46 additions and 3 deletions
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13
mysql-test/r/func_gconcat.result
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@ -641,3 +641,16 @@ select charset(group_concat(c1 order by c2)) from t1;
charset(group_concat(c1 order by c2))
latin1
drop table t1;
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;
a CHAR_LENGTH(b)
1 120000
2 120000
SELECT CHAR_LENGTH( GROUP_CONCAT(b) ) FROM t1;
CHAR_LENGTH( GROUP_CONCAT(b) )
240001
SET GROUP_CONCAT_MAX_LEN = 1024;
DROP TABLE t1;