GSoC 2017 weekly progress reports (week 3)

Project: Explicitly support predicate locks in index AMs besides b-tree

Hi,

During this week, I continued my work on testing and created my first patch
for gist index. I have also started working on the hash index. In summary,
I have done following things in this week.

1) updated tests to check false positives

2) created tests for index scan

3) fixed a small issue with "make check"

4) fixed a small bug in the code by updating the location of
predicatelockpagesplit().

5) read the source code of hash index to understand its implementation

Regards,
Shubham

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