NTILE may cause problems in big statements
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                 Key: CORE-6325
                 URL: http://tracker.firebirdsql.org/browse/CORE-6325
             Project: Firebird Core
          Issue Type: Bug
          Components: Engine
    Affects Versions: 4.0 Beta 2
            Reporter: Adriano dos Santos Fernandes


I do not have a test case, but NTILE is using USHORT for its impure offset, 
which may cause it to overflow and use the space of another statement or 
expression.

That may cause wrong value or even crashes.

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