Add support for case when sql
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-4412-case-when-sqlfunction
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-4412-case-when-sqlfunction
Add test cases for casewhen and resolve its types without else clause
Code clean up and variable renaming according to Paul's suggestion
Merge branch 'master' of github.com:VoltDB/voltdb into ENG-4412-case-when-sqlfunction
Add sql coverage test cases and planner test cases for case when
Merge pull request #972 from VoltDB/master

Merge recent master to case when branch
Merge branch 'master' into ENG-4412-case-when-sqlfunction
Turn on the CASE WHEN no default else clause test
Merge branch 'ENG-4412-case-when-sqlfunction' of github.com:VoltDB/voltdb into ENG-4412-case-when-sqlfunction
Refix according to Paul's review
Merge pull request #959 from VoltDB/ENG-4412-case-when-sqlfunction

Eng 4412 case when sqlfunction