I guess no one read the thread I posted a link to.
Dead pig, uninjured, fully alive human.
(and a whole lot of internet squabbling...of course)
Oh well.
I read it. I wonder if that video is available. The pictures.
For a big knife that would be used as back up and have the ability to slash and cut brush, or be useful, some one recommended a CS Magnum Khukri. I have one, and would probably not choose it as "ideal" in that situation.
One of their newer ones with the guard would be better (if you had any thought of poking an animal with it). They will chop, but aren't quite as rigid for stabling as I would like.
The actual Cold Steel Khukri (not the machete version) would be a good choice, especially with the new version with a guard! If you They will make a ferocious stab, or cut. With the size pig that gentleman was killing with the Jungelas, a hard cut would sever the spine, or take the entire head off with a chop.
A Swamprat Ruki, Waki, Scrapyard Scrapazashi, or Busse AK, or Ruki would make a longer reach option, and are all actual useable in a hard use, beating on trees, and slashing brush (though they will be a bit thicker than you would want for machete work).
I'd recommend a boar spear for range and ability to keep the animal off of you.
There is a video of a Professional Hunting Guide poking a few holes in a water buffalo. The beast was killing his dad, and had been shot a few times. Because it was on his pa, they could not shoot it. He ran up to it's side and tickled it's ribs with a CS sub hilt (I believe it was the 8 inch blade, single edge, pointy warn-cliff version) twice or three times, and it dropped. He got the lung and heart?
The only way I would consider a knife as the primary for hogs would be in the company of trained hog hunting dogs. (but I don't think that was the OP's intent).
On a side note, Cold Steel has some very interesting options new out this year, including several new spears, and pole arms.
I think the Swiss Halberd would be interesting. Ability to stab like boar spear, and control the animal, and keep it at distance. The axe edge would deliver skull halving or spine severing chops as well.
They have several new halberd designs out, including versions that are significantly lighter than the Swiss halberd.