Provide optimization in retrieval for non correlated filter expression 
evaluated to false
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                 Key: CORE-5394
                 URL: http://tracker.firebirdsql.org/browse/CORE-5394
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
            Reporter: Karol Bieniaszewski


Will be good to see that Firebird do not fetch streem if non correlated filter 
expresion evaluated to false

is uppose simplest possible case is: 

SELECT * FROM RDB$RELLATIONS WHERE 1=0

will be good to see here 0 fetches

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