> Oh I see what you mean. Let's just use some notation like:
>
> "$(#1) || substring($(#3) from 2 for 1)"
>
> for positional notation, or
>
> "$(col_1) || substring($(col_3) from 2 for 1)"
>
> for name based. You can't have an operator called $( so there
> shouldn't be any collision with PG operators in the expression - and
> to allow the user to include a constant of $(...), we can tell them to
Got it.
-----------------------------------------------
Quan Zongliang
quanzongliang@gmail.com
CIT Japan: http://www.cit.co.jp
CIT China: http://www.citbj.com.cn