GSoC 2017 Proposal for predicate locking in hash index

Hi,

Now that hash index support write-ahead logging, it will be great if we add
support for predicate locking to it.
Implementation of predicate locking in hash index seems very simple.
I have already made changes in the code. I am currently working on testing.

Here is my approach

1) PredicateLockPage()

->_hash_first()

During a scan operation, acquire a predicate lock on the primary page of a
bucket.

2) CheckForSerializableConflictIn()

->_hash_doinsert()

During an insert operation, check if there is any predicate lock on the
primary page of a bucket.

3) PredicateLockPageSplit()

In case of a bucket split, copy predicate lock from the primary page of an
old bucket to the primary page of a new bucket.

Any suggestions or corrections will be appreciated.

Regards,
Shubham

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