Re: How to get value of 'Param' of the WHERE clause in the FDW?

Thank you for the reply! I'm trying to get the correct value and I need it
at the execution stage. I just don't see how to get baserestrictinfo in
the execution stage or if the 'abc123' value would be there at all...

Kind regards,
Dmitry

On Fri, Sep 25, 2015 at 11:44 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Dmitry Chichkov <dchichkov(at)gmail(dot)com> writes:
> > It seems like during fdwPlan(..., RelOptInfo *baserel) stage I'm getting
> > baserel->baserestrictinfo, in which I see a Node *x of IsA(x, Param).
> > But it looks like the value 'abc123' is not yet available in the planning
> > stage, right? And I don't see how can I get baserestrictinfo in the
> > execution stage or if the 'abc123' value would be there...
>
> If you are trying to get an estimated value for some subexpression at plan
> time, estimate_expression_value() is what to use; see for example the uses
> of that function in selfuncs.c. Keep in mind that it *is* an estimate and
> cannot be guaranteed to still be correct at execution time, since the plan
> might be re-used with another parameter value.
>
> regards, tom lane
>