Marco,
did you have any new informations on this issue?
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Desc for any field, based on User string Function, return size 4000:
select myStringFunction() as test from dual:
desc: test VARCHAR (4000)
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Greetings

This did not make it into 4.1, which focuses on Unicode support. We'll look into this for a 4.1 patch release.

up

Is it still in TODO?
It's really memory-eating behavior, and because it in our selects all string functions surrounded with substr(function(), 1, 255). But it's not good solution, more good solution is to make strings in TOracleDataset dinamically-allocated. We waiting it!