[postgis] Indexing....ack!

[Paul Ramsey]

> The default estimate was, I think, 0.5%.  The new one is, I think,
> 0.005%.  Its kinda of silly to use a constant number, but to actually
> compute an actual estimate would probably take longer than to do the
> actual query.

How do the BTree indexes do this? Do they not use some information
gathered by VACUUM to do a "guess" about the extent of the query? Would
it be possible for us to do similar things?

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