Optimize 1=0 and 0=1
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Key: CORE-6394
URL: http://tracker.firebirdsql.org/browse/CORE-6394
Project: Firebird Core
Issue Type: Improvement
Components: Engine
Affects Versions: 3.0.6
Reporter: Jiri Cincura
Priority: Minor
A lot of ORMs do `select ... from xyz where 0=1` when an empty result set is
needed (either directly or as a part of subquery). Firebird at the moment does
natural scan of the table and that can cause a lot of fetches when the table is
big.
Obviously the superset would be to evaluate all "constant" expressions and
"squash", but that might not be directly easily possible at the moment.
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