don't push down meeting aggregate node, and add a test case based on John's comment on the ticket
Merge branch 'master' into ENG-6485
Merge branch 'master' into ENG-6485
modify test cases from pushing down limit to not pushing down when meeting aggreage nodes
rename the function and simplify checking in junit
Merge branch 'master' into ENG-6485
Merge pull request #1492 from VoltDB/ENG-6485

Eng 6485 fix bug of limit and group by