01.04.2011 10:47, Dmitry Yemanov wrote:
> Personally, I don't see problems with combining both approaches, i.e.
> use the fast "versioning" mode for the a priori valid changes and
> perform the explicit validation for possibly problematic changes. This
> way we could easily allow altering string columns to shorter lengths,
> altering strings to numerics, etc. Someone just needs to implement all
> these checks :-)

   May I suggest to add non-standard optional clause NOVALIDATE for users who 
are sure 
that validation is unnecessary and want to save time on commit?..

-- 
   SY, SD.

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