| From: | Darafei "Komяpa" Praliaskouski <me(at)komzpa(dot)net> |
|---|---|
| To: | Nikita Glukhov <n(dot)gluhov(at)postgrespro(dot)ru>, Alexander Korotkov <aekorotkov(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Fedor Sigaev <teodor(at)sigaev(dot)ru> |
| Subject: | Re: compress method for spgist - 2 |
| Date: | 2017-09-20 23:06:30 |
| Message-ID: | CAC8Q8tJ6jPJd_BJftq9CVrUNTNM__P-H4jbNO9qr5oV=bYJU0w@mail.gmail.com |
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| Lists: | pgsql-hackers |
>
> It is possible for bbox->low.x to be NaN when circle->center.x is and
> circle->radius are both +Infinity.
>
What is rationale behind this circle?
It seems to me that any circle with radius of any Infinity should become a
[-Infinity .. Infinity, -Infinity .. Infinity] box. Then you won't have
NaNs, and index structure shouldn't be broken.
If it happens because NaN > Infinity, then the check should be not for
isnan, but for if (low>high){swap(high, low)}. It probably should be a part
of box, not a part of circle, maths.
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