Details
-
Bug
-
Status: Closed (View Workflow)
-
Major
-
Resolution: Fixed
-
23.10, 25.10
-
None
Description
I run this script:
DROP TABLE IF EXISTS t1; |
CREATE TABLE t1 (c1 VARCHAR(20) CHARACTER SET latin1 COLLATE latin1_swedish_ci) ENGINE=ColumnStore; |
INSERT INTO t1 VALUES ('a'),('A'),('ä'),('Ä'),('ã'),('Ã'); |
SELECT c1, COUNT(*) FROM t1 GROUP BY c1; |
+------+----------+
|
| c1 | COUNT(*) |
|
+------+----------+
|
| ä | 2 |
|
| a | 4 |
|
+------+----------+
|
SELECT DISTINCT c1 FROM t1; |
+------+
|
| c1 |
|
+------+
|
| a |
|
| ä |
|
+------+
|
Looks good so far. In the given collation:
- A WITH TILDE ABOVE is equal to accent-less A
- A WITH DIAERESIS is a separate letter (sorted in the end of the Swedish alphabet after Z)
If I do not use HEX in ORDER BY - everything is fine also.
MariaDB [gjd]> SELECT c1, COUNT(*) FROM t1 GROUP BY c1 ORDER BY c1;
|
+------+----------+
|
| c1 | COUNT(*) |
|
+------+----------+
|
| a | 4 |
|
| ä | 2 |
|
+------+----------+
|
Things go wrong if do ORDER BY HEX(c1):
SELECT c1, COUNT(*) FROM t1 GROUP BY c1 ORDER BY HEX(c1); |
+------+----------+
|
| c1 | COUNT(*) |
|
+------+----------+
|
| A | 1 |
|
| a | 1 |
|
| Ã | 1 |
|
| Ä | 1 |
|
| ã | 1 |
|
| ä | 1 |
|
+------+----------+
|
SELECT DISTINCT c1 FROM t1 ORDER BY HEX(c1); |
+------+
|
| c1 |
|
+------+
|
| A |
|
| a |
|
| Ã |
|
| Ä |
|
| ã |
|
| ä |
|
+------+
|
Notice, the numbers of records in the result sets have changed. These two queries are expected to return two rows each.
Attachments
Issue Links
- is part of
-
-
- Closed
-