Re: [HACKERS] psql - add ability to test whether a variable exists

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От Fabien COELHO
Тема Re: [HACKERS] psql - add ability to test whether a variable exists
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Msg-id alpine.DEB.2.20.1708261953040.27500@lancre
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Ответ на Re: [HACKERS] psql - add ability to test whether a variable exists  (Fabien COELHO <coelho@cri.ensmp.fr>)
Ответы Re: [HACKERS] psql - add ability to test whether a variable exists  (Pavel Stehule <pavel.stehule@gmail.com>)
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> Any colon prefixed syntax can be made to work because it is enough for the 
> lexer to detect and handle... so
>
>  :{defined varname}
>
> may be an option, although I do not like the space much because it adds some 
> fuzzyness in the lexer which has to process it. It is probably doable, 
> though. I like having a "?" because there is a question. Other
> suggestions somehow in line with your proposal could be
>  :{?varname}
>  :{varname?}
> what do you think?

Here is a version with the :{?varname} syntax.

-- 
Fabien.
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