Refactor hash aggregation into three functions with the same API.
Merge the recent inline serial aggregation. API gets cleaner and reslove the conflicts.
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-6451-inline-agg-hash
Add EE support for hash aggregation. Factoring the code to use the same API for serial and hash agg
Add full support for hash inline aggregation.
Merge hash inline aggregation work
Refresh the planner tester
Merge branch 'master' of github.com:VoltDB/voltdb into inline-agg
Turn off this tests because valgrind timeout
Fix the test cases because of hash aggregate inlined
Merge pull request #1420 from VoltDB/inline-agg

Inline agg - hash aggregate