Sort order is wrong when ordering by multiple columns starting with collate
UNICODE_CI or UNICODE_CI_AI
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Key: CORE-5940
URL: http://tracker.firebirdsql.org/browse/CORE-5940
Project: Firebird Core
Issue Type: Bug
Components: Charsets/Collation
Affects Versions: 3.0.4
Environment: Firebird 2.5 embedded(Win32) and 3.0(Win32), Windows 7
Reporter: Hiro Nonomura
If a sorting was ordered by a single column with collate UNICODE, the result
could be shared with collate UNICODE_CI or UNICODE_CI_AI. But when it comes to
ordering by multiple columns, it should be a different story.
UNICODE_CI and UNICODE_CI_AI are working as if requested by collate UNICODE
even in ordering by multiple columns.
I have tested in Firebird 2.5 and 3.0. The following is a result by Firebird
3.0; iSQL (Windows 7)
SQL> CREATE DATABASE 'TEST.FDB';
SQL> CREATE TABLE A (F1 INTEGER NOT NULL PRIMARY KEY, F2 VARCHAR(10) CHARACTER
SET UTF8 NOT NULL);
SQL> INSERT INTO A (F1,F2) VALUES (1,'a');
SQL> INSERT INTO A (F1,F2) VALUES (2,'A');
SQL> INSERT INTO A (F1,F2) VALUES (3,'a');
SQL> SELECT F2,F1 FROM A ORDER BY F2 COLLATE UNICODE_CI, F1;
F2 F1
========== ============
a 1
a 3
A 2
Correct result should be:
F2 F1
========== ============
a 1
A 2
a 3
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