Re: contrib/ltree for 7.2 or 7.3 ?

From: Teodor Sigaev <teodor(at)stack(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>, Oleg Bartunov <oleg(at)sai(dot)msu(dot)su>, Pgsql Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: contrib/ltree for 7.2 or 7.3 ?
Date: 2002-07-30 18:52:11
Message-ID: 3D46E05B.1000304@stack.net
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I'm now working on it.

Tom Lane wrote:
>>Oleg Bartunov wrote:
>>
>>>One known issue: It'll not works with 64-bit OS. We'll certainly fix this
>>>but will appreciate if somebody with access to 64-bit machine could help us.
>>
>
> Actually, it dumps core instantly on 32-bit machines too, if they are
> pickier about alignment than Intel hardware is. You can't map
> structures onto char[] arrays that start at odd byte offsets and not
> expect trouble.
>
> I also do not trust macros like this:
>
> typedef struct {
> int32 len;
> uint16 numlevel;
> char data[1];
> } ltree;
>
> #define LTREE_HDRSIZE ( sizeof(int32) + sizeof(uint16) )
>
> because they take no account of the possibility of padding between fields.
>
> regards, tom lane
>
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--
Teodor Sigaev
teodor(at)stack(dot)net

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