03e56f798e
The original API definition was incapable of supporting whole-index scans because there was no way to invoke leaf-value reconstruction without checking any qual conditions. Also, it was inefficient for multiple-qual-condition scans because value reconstruction got done over again for each qual condition, and because other internal work in the consistent functions likewise had to be done for each qual. To fix these issues, pass the whole scankey array to the opclass consistent functions, instead of only letting them see one item at a time. (Essentially, the loop over scankey entries is now inside the consistent functions not outside them. This makes the consistent functions a bit more complicated, but not unreasonably so.) In itself this commit does nothing except save a few cycles in multiple-qual-condition index scans, since we can't support whole-index scans on SPGiST indexes until nulls are included in the index. However, I consider this a must-fix for 9.2 because once we release it will get very much harder to change the opclass API definition.
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