The following is Open Game Content from a 3PP Source
HERON SPEARING A FROG
You can extend your reach with a spear beyond what most folks can.
Prerequisite: Sojutsu combat style, base attack bonus +8.
Benefit: You shift your hands to the very butt of your spear and lunge forward with the entire length of the shaft extended, giving your weapon double the normal reach. This is a full attack action and you get only one attack, at your highest attack bonus.