Re: [HACKERS] quote_literal with NULL

On Mon, 2007-10-15 at 12:52 +1000, Brendan Jurd wrote:
> On 10/12/07, Simon Riggs <simon(at)2ndquadrant(dot)com> wrote:
> > I think you should add some examples to show how we would handle an
> > INSERT or an UPDATE SET with quite_nullable() and a SELECT WHERE clause
> > with quote_literal. The difference is a subtle one, which is why nobody
> > mentioned it before, so it needs some better docs too.
> >
> > A cross-ref to the functions page would help also.
>
> Alright, I've improved the documentation along the lines suggested by
> Simon. There's a full example on doing a null-safe dynamic UPDATE, as
> well as a brief discussion about being wary of using comparison
> operators with NULLs (e.g., in WHERE clauses). Cross references
> abound.

Cool

> I did make a version of the patch which has the pg_proc entries for
> quote_literal and quote_nullable both pointing to the same internal
> function. I thought this was a tidier solution, but it failed
> regression test #5 in opr_sanity; apparently two entries in pg_proc
> can't have the same prosrc and differing proisstrict?

Sanity prevails, I guess. :-)

--
Simon Riggs
2ndQuadrant http://www.2ndQuadrant.com