Oh yeah, actually that's an important enhancement if a lot of the
lines are going to be 100% inside their target polygons, to avoid
running the full Intersection() test...
ST_Within() and ST_Contains() are the same, (code actually just gates
one into the other, with reversed arguments) and as
Thanks Paul.
What if I want to say ST_Contains(A, B)? And will it matter if I say
ST_Within(B, A) instead? I have a feeling it will, since
most likely the query planner will decide to process A row by row and find
a suitable B each time. In this case, we need a GiST index on B, so that
we could
