Submitted by: Stephan Perktold (stephan)

Duplicates CORE2457

This should be the same problem as described in CORE2457, just that it is still valid for Firebird 2.5 servers

With character set UTF8 and collation UNICODE_CI the following error occurs under special conditions (index and select criteria):

GDS Exception. 335544333. internal Firebird consistency check (Invalid expression for evaluation (303), file: evl.cpp line: 819)

The following simple test case can be used to reproduce the error:

CREATE TABLE TEST (
ID BIGINT NOT NULL,
D DATE,
C VARCHAR(50)
);
ALTER TABLE TEST ADD CONSTRAINT PK_TEST PRIMARY KEY (ID);
CREATE INDEX TEST_IDX1 ON TEST (D, C);
SELECT * FROM TEST WHERE (D > '2000-01-01' AND C='test') ORDER BY D, C

We have to stress the fact that UTF-8 is a must for storing international data. And in order to be accepted by the users, a case insensitive collation is required (for indices).
This bug prevents that we can use UTF-8, which we need for storing reservation data in various languages and character sets (for ex. Cyrillic and Latin-1)