index not used if column compared to function result (upper)
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Key: CORE-3696
URL: http://tracker.firebirdsql.org/browse/CORE-3696
Project: Firebird Core
Issue Type: Bug
Affects Versions: 2.5.1, 2.1.1
Environment: win7, 32bit
Reporter: Lukas Masak
Priority: Minor
create table test (col1 varchar(20) collate UTF8);
CREATE INDEX IDX_TEST1 ON TEST computed by (upper(COL1));
select * from test where upper(col1) like upper('b%');
> PLAN (TEST NATURAL)
select * from test where upper(col1) like 'B%';
> PLAN (TEST INDEX (IDX_TEST1))
CREATE INDEX IDX_TEST1 ON TEST (COL1); same plans
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