Re: unfathomable comment in psqlscan.l

Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> While reviewing Pavel's patch for variable quoting in psql, I came
> upon the following comment in psqlscan.l:

> /*
> * The variable value is just emitted without any
> * further examination. This is consistent with the
> * pre-8.0 code behavior, if not with the way that
> * variables are handled outside backslash commands.
> */

> I cannot figure out for the life of me what this is referring to.

At the other place where :foo is expanded, the value is pushed for
re-scanning; thus for example ":bar" within the variable value
might be further expanded as a reference to some other variable.
Inside backslash commands we don't do that but just take the value
literally.

regards, tom lane