Re: WIP: Fast GiST index build

I found that results of previous tests with USNOA2 were not fully correct.
Tables for tests with various parameters contained tuples in different
order. I assumed that query
CREATE TABLE tab2 AS (SELECT * FROM tab1);
creates tab2 as exact copy of tab1, i.e. tab2 contain tuples in same order
as tab1. But actually, it isn't always so. In aggregate with only few used
test cases it can cause significant error.
I'm going to make use some more thought-out testing method. Probably, some
more precise index quality measure exists (even for R-tree).

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With best regards,
Alexander Korotkov.