Hackers,
WIP patch of fast GiST index build is attached. Code is dirty and comments are lacking, but it works. Now it is ready for first benchmarks, which should prove efficiency of selected technique. It's time to compare fast GiST index build with repeat insert build on large enough datasets (datasets which don't fit to cache). There are following aims of testing:
1) Measure acceleration of index build.
2) Measure change in index quality.
I'm going to do first testing using synthetic datasets. Everybody who have interesting real-life datasets for testing are welcome.
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With best regards, Alexander Korotkov.