fix NPE in join-query compilation when using salted tables
fix NPE in join-query compilation when using salted tables
code refine
1. Code refactoring in HashJoinRegionScanner and ScanProjector; 2. Bug fix in ValueBitSet; 3. Change TableRef#equals() and TableRef#hashCode(); 4. Add interface Tuple#getValue(cf, cq, ptr)
Remove files checked-in by mistake
1. Add skip-merge optimization for joins; 2. Avoid re-applying optimize() on join queries
change test cases
Merge remote-tracking branch 'upstream/master'
Revert changes to TableRef.java
Merge pull request #651 from maryannxue/master

Fix issue #642 NPE on Join over Salted table