Succah 4ab

If [the succah] was taller than twenty amos and the leaves of the palm branches that comprise its s’chach were dangling within twenty amos of the floor, if their shade is greater than their sunlight [the succah] is valid. But if not, [the succah] remains invalid.

. . . .

Where [the succah] was taller than twenty amos and one built a platform in its middle—If there is from the edge of the platform until the wall four amos in each direction, [the succah] is invalid. But if the distance is less than four amos, [the succah] is valid.

. . . .

If [the succah] was taller than twenty amos and one built in it a pillar that is ten tefachim tall, and it contains the minimum required area for a succah, Abaye thought to say extend and raise the partition on each of the pillar’s sides to the s’chach above, creating a valid succah on the pillar top. However, Rava said [to Abaye]: We need noticeable walls and there are none.

The Rabbis taught – ONE DROVE FOUR POLES into the roof of a house AND PLACE S’CHACH ACROSS THEM without building walls between the poles, R’ YAAKOV RULES VALID AND THE SAGES INVALIDATE.

. . . .

Teiku – Let [the question] stand unresolved.