Fixed a latch deadlock in the BTree. Since our leaves are double-linked, Mohan's protocol needed minor modifications. However, reverse scanning the tree could currently still lead to latch deadlock. Avoiding it is rather complex, and I'm deferring it for now.

git-svn-id: https://hyracks.googlecode.com/svn/branches/hyracks_dev_next@848 123451ca-8445-de46-9d55-352943316053
1 file changed