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GiST and SP-GiST n-D indexes (based on GIDX) with overlaps, contains, within, and equals operators #293
The current version of PostGIS provides GiST n-D indexes (based on GIDX) only with the &&& (overlaps) operator. This PR extends the GiST n-D indexes for three additional operators: ~~ (contains) @@ (within) ~~= (equals). It also implements SP-GiST n-D indexes that support these four operators.
@alesuiss may I ask you to split this into two parts then, so we can merge it easier?
a green one with sp-gist comparing itself to non-indexed scan, and a failing to-fix one exposing the bug in gist? this can probably be achived by temporarily commenting out failing gist test.