There's minor change against the previous one(
* merge branch master(Aug 16) into the patch
* clean code and make some comment
Performance result is here
It seems hash index is a little better on index creation and selection.
But maybe it's in the range of noise, I'm not sure.
I'd like to try it with a bigger dataset (e.g. table with 10GB) but there is
not enough space in my computer.
Anyone interest can make a test on a bigger data set.
DKERC, Harbin Institute of Technology, China
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