Re: [HACKERS] Variable substitution in psql backtick expansion

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От Corey Huinker
Тема Re: [HACKERS] Variable substitution in psql backtick expansion
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Msg-id CADkLM=fKTp39o1HXk9Or_0LWb=+zarKuF3ja08EZEbzcQJ_9yg@mail.gmail.com
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Ответ на Re: [HACKERS] Variable substitution in psql backtick expansion  (Fabien COELHO <coelho@cri.ensmp.fr>)
Ответы Re: [HACKERS] Variable substitution in psql backtick expansion
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On Tue, Apr 11, 2017 at 2:56 AM, Fabien COELHO <coelho@cri.ensmp.fr> wrote:

Hello Pavel,

I think so some local expression evaluation could be - but it should not be
placed in \if statement

 Why?

\expr issupported :VERSION_NUM >= 10000

 Hmmm. Although I do not buy this, it could work as a replacement for \set which it seems cannot be upgraded because some people may rely on it to just store whatever comes after it in a variable.

I have no strong opinion on how expressive expressions should be, but having a separate \expr (or \setexpr, etc) gives us a green field to develop them.

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