HashJoinRegionScanner code refine
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Minor cleanup to SpillableGroupBy
Merge pull request #637 from maryannxue/master

Code refine in HashJoinRegionScanner
Remove unnecessary Aggregator.init() method
Add explicit test of creating a table again
Merge branch 'master' of github.com:forcedotcom/phoenix
Increase heap for test run as we're getting some OOM errors