Support for conditional trigger firing (WHEN clause)
----------------------------------------------------

                 Key: CORE-3657
                 URL: http://tracker.firebirdsql.org/browse/CORE-3657
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
            Reporter: Thomas Steinmaurer


Currently in Firebird, to omit trigger code execution, one can wrap the entire 
trigger body into an IF block, but the trigger still fires, but no PSQL code is 
executed. E.g. Oracle supports a WHEN clause in the trigger DDL syntax to 
define a condition, which must evaluate to TRUE for firing a trigger.


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