Firebird 2.1 Language Reference Update

PSQL statements
Description: In Firebird 2.0 and above, PSQL code may call UDFs without assigning the result value, i.e. like a
Pascal procedure or C void function. In most cases this is senseless, because the main purpose of almost every
UDF is to produce the result value. Some functions however perform a specific task, and if you're not interested
in the result value you can now spare yourself the trouble of assigning it to a dummy variable.
Note
RDB$GET_CONTEXT and RDB$SET_CONTEXT, though classified in this guide under internal functions, are
actually a kind of auto-declared UDFs. You may therefore call them without catching the result. Of course this
only makes sense for RDB$SET_CONTEXT.
WHERE CURRENT OF valid again for view cursors
Changed in: 2.0, 2.1
Description: Because of possible reliability issues, Firebird 2.0 disallowed WHERE CURRENT OF for view cursors.
In Firebird 2.1, with its improved view validation logic, this restriction has been lifted.
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