On Tue, Jan 26, 2010 at 2:12 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Robert Haas <robertmhaas@gmail.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.
Ah, makes sense. Thanks.
...Robert
