Re: [HACKERS] Undefined psql variables

>> [...] Obviously the \if stuff is things we don't have yet either, but 
>> it seems less likely to have surprising side-effects.

I agree, a more generic solution seems better than an ad-hoc one.

Currently the value of a non existing psql-variable is... its own 
reference:-(
  psql> \echo :x  > :x

I'm not sure of the rational, apart from the probable lexer implementation 
point of view. Maybe an empty string or 0 or some configurable value would 
provide better alternative.

> PGSERVICE=foo psql -f script.sql --set var1=a --set var2=b --set var3=d ...
> --set varN=n

How are the variable typically used in the script?

-- 
Fabien.