From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: unfathomable comment in psqlscan.l |
Date: | 2010-01-26 19:22:19 |
Message-ID: | 603c8f071001261122i7971cb16kd62e96dbbb4854dd@mail.gmail.com |
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Lists: | pgsql-hackers |
On Tue, Jan 26, 2010 at 2:12 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> 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.
Ah, makes sense. Thanks.
...Robert
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