| From: | Emre Hasegeli <emre(at)hasegeli(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | PostgreSQL Bugs <pgsql-bugs(at)postgresql(dot)org> |
| Subject: | Re: Line intersection point is wrong |
| Date: | 2016-06-21 20:25:58 |
| Message-ID: | CAE2gYzxH_gO=uK4FXt13i6GERYYi+_QJOZUYt3LB=X3T2dWXqw@mail.gmail.com |
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| Thread: | |
| Lists: | pgsql-bugs |
> Basically this comes down to the fuzziness of the FPzero/FPeq tests.
>
> It might be possible to fix this particular problem by changing the FPzero
> tests in line_parallel() to exact "== 0" tests; though we would likely
> be well advised to still keep the main test as FPeq.
That can create whole bunch of different problems, because then the
fuzziness wouldn't apply to the values around the zero. I don't think
there is any good solution without removing those macros all together.
We should just fix what is obviously broken for now.
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