First sbtree draft was added.
Issue #1602. SBTree implementation and performance test was added.
Issue #1602. Items removal was added.
Merge branch 'develop' into sbtree
Merge branch 'develop' into sbtree
Issue #1602. Fix few of SBTree issues but performance test results were not changed.
Issue #1602. Small SBTree performance improvement.
Issue #1602. Range query support was added.
Issue #1602. Composite keys support was implemented.
Issue #1606 WAL was added in SBTree but not tested yet.
Issue #1629 markDirty and release methods were refactored.
Issue #1629 allocateNewPage was added.
Issue #1629 ODiskCache#pinPage method was added.
Issue #1626 First version of sparce array.
Issue #1626 Sparce array was implemented.
Issue #1626 Sparse array was integrated in
 durable page class.
Merge branch 'develop' into sbtree
Issue #1626 Durable component abstraction was extracted.
SBTree changes are logged in WAL.
Issue #1626 WAL SBTree test was passed.
Issue #1607 SBTree index is not durable in non tx mode.