Re: remove the unneeded header file math.h in binaryheap.c

On 2026-Jan-15, Tom Lane wrote:

> Yeah ... my recollection is that some of our inclusions of <math.h>,
> and also of <limits.h>, were needed because assorted platforms didn't
> follow the C/POSIX standards about which headers should provide which
> symbols. Maybe that's all cleaned up now. I'd worry about Solaris
> and AIX as being the most likely stragglers.

I think we have enough Solaris in the buildfarm to know if there are any
problems. As for AIX, we don't support it currently, and I guess we'll
know from the developers if we need any patches there.

> Another likely source of obsolete <math.h> usages is in the datetime
> code, as a leftover from our old floating-point timestamps.

Yeah, there was one in date.h related to that, which I mentioned in my
reply to Andres.

I have just pushed it. Now it's time for the buildfarm to speak ...

Thanks liujinyang, and welcome -- may your Postgres contribution days be
long and fertile.

--
Álvaro Herrera 48°01'N 7°57'E — https://www.EnterpriseDB.com/
"No nos atrevemos a muchas cosas porque son difíciles,
pero son difíciles porque no nos atrevemos a hacerlas" (Séneca)