◆ bbox_gist_fallback_split()

void bbox_gist_fallback_split	(	GistEntryVector *	entryvec,
		GIST_SPLITVEC *	v,
		meosType	bboxtype,
		void()(void , void *)	bbox_adjust
	)

Trivial split: half of entries will be placed on one page and the other half on another page.