Re: sortsupport for text

From: Peter Geoghegan <peter(at)2ndquadrant(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: sortsupport for text
Date: 2012-07-23 15:34:29
Message-ID: CAEYLb_UodiDUrO8bwnBJ0JqqUDdQyHjX6ZkzhgPqdiCTq9myWg@mail.gmail.com
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On 23 July 2012 16:09, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> However, what this really boils down to is that you and Peter don't
> like this line of code:
>
> + tss->buflen1 = TYPEALIGN(TEXTBUFLEN, len1);

I can only speak for myself, though I agree with your summary here.

> What would you like it to say instead?
>
> The obvious formulation is:
>
> while (len1 < tss->buflen1)
> tss->buflen *= 2;

That's what I had in mind. +1.

> Or perhaps the following, which will normally be more efficient,
> though possibly not as efficient as what I've got there now:
>
> tss->buflen = 1 << ffs(len1);

I'm sorry, I don't follow you here. What is ffs() ?

--
Peter Geoghegan http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training and Services

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