From 8aa2d6bf920d513c6d9ffb260251ec893232f5da Mon Sep 17 00:00:00 2001 From: unknown Date: Tue, 27 Mar 2007 19:28:04 +0300 Subject: Bug #26815: When creating a temporary table the concise column type of a string expression is decided based on its length: - if its length is under 512 it is stored as either varchar or char. - otherwise it is stored as a BLOB. There is a flag (convert_blob_length) to create_tmp_field that, when >0 allows to force creation of a varchar if the max blob length is under convert_blob_length. However it must be verified that convert_blob_length (settable through a SQL option in some cases) is under the maximum that can be stored in a varchar column. While performing that check for expressions in create_tmp_field_from_item the max length of the blob was used instead. This causes blob columns to be created in the heap temp table used by GROUP_CONCAT (where blobs must not be created in the temp table because of the constant convert_blob_length that is passed to create_tmp_field() ). And since these blob columns are not expected in that place we get wrong results. Fixed by checking that the value of the flag variable is in the limits that fit into VARCHAR instead of the max length of the blob column. mysql-test/r/func_gconcat.result: Bug #26815: test case mysql-test/t/func_gconcat.test: Bug #26815: test case sql/item_sum.cc: Bug #26815: wrong length was checked sql/sql_select.cc: Bug #26815: wrong length was checked --- mysql-test/t/func_gconcat.test | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'mysql-test/t/func_gconcat.test') diff --git a/mysql-test/t/func_gconcat.test b/mysql-test/t/func_gconcat.test index 3ff4b35873b..0dd82864520 100644 --- a/mysql-test/t/func_gconcat.test +++ b/mysql-test/t/func_gconcat.test @@ -497,4 +497,14 @@ select f2,group_concat(f1) from t1 group by f2; --disable_metadata drop table t1; -# End of 4.1 tests +# +# Bug #26815: Unexpected built-in function behavior: group_concat(distinct +# substring_index()) +# +CREATE TABLE t1(a TEXT, b CHAR(20)); +INSERT INTO t1 VALUES ("one.1","one.1"),("two.2","two.2"),("one.3","one.3"); +SELECT GROUP_CONCAT(DISTINCT UCASE(a)) FROM t1; +SELECT GROUP_CONCAT(DISTINCT UCASE(b)) FROM t1; +DROP TABLE t1; + +--echo End of 5.0 tests -- cgit v1.2.1