Hello, hackers. I've fixed split algorithm that was implemented in cube extension. I've changed it according to the original Guttman paper (old version was more simple algorithm) and also ported Alexander Korotkov's algorithm from box datatype indexing that work faster and better on low dimensions.
On my test dataset (1M records, 7 dimensions, real world database of goods) numbers was following: Building index over table (on expression): old: 67.296058 seconds new: 48.842391 seconds Cube point search, mean, 100 queries old: 0.001025 seconds new: 0.000427 seconds Index on field size: old: 562 MB new: 283 MB Stas.
split.diff
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