| From: | Andrew Dunstan <andrew(at)dunslane(dot)net> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Nikolay Samokhvalov <samokhvalov(at)gmail(dot)com> |
| Subject: | Re: xpath processing brain dead |
| Date: | 2009-02-27 02:13:28 |
| Message-ID: | 49A74C48.2020903@dunslane.net |
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| Thread: | |
| Lists: | pgsql-hackers |
Tom Lane wrote:
> Hmm, does this proposal require adding a test of well-formed-ness to
> a code path that doesn't currently have one? If so, is that likely
> to contribute any noticeable slowdown?
>
> I can't offhand see an objection to this other than possible performance
> impact.
>
>
>
Yeah, testing the well-formedness might cost a bit. We could
short-circuit the test by applying some comparatively fast heuristic tests.
Or we could decide that we'll just fix the xpath prefix part for 8.3 and
keep the wrapping. I don't want to spend a huge effort on fixing
something I regard as fundamentally broken.
I'll do some tests to see what the cost of extra xml parsing might be.
cheers
andrew
We
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