Optimization Suggestion
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Key: CORE-5683
URL: http://tracker.firebirdsql.org/browse/CORE-5683
Project: Firebird Core
Issue Type: Improvement
Affects Versions: 3.0.2, 2.5.7
Reporter: Stefan Schmaltz
We have a Database with UNICODE_CI and all varchar field have an Index.
So when executing
SELECT ...WHERE field='value' ... ORDER BY field
the result is fast
but when executing
SELECT ... WHERE UPPER(field)=UPPER('value') ... ORDER BY UPPER(field)
the result is very slow.
Suggestion: Case Insensitive Index should ignore UPPER (AND LOWER) because
there is no difference
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