01.09.2014 11:24, Alex Peshkoff wrote:

> That's nice - but what should happen with that special syntax when BLR
> follows DYN?

Easy option - deprecate the command.

A more clever one - not DROP (nullify) the source but set some flag to 
HIDE it instead. That flag would mean returning NULL instead of source 
blob for user requests, while still returning a proper source blob for 
internal requests.

A compromise - ALTER ... HIDE SOURCE may be implemented via SET TO NULL 
in v3 and via the aforementioned trick starting with v4.


Dmitry


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