IMRU: add the ability to query aggregation level inside reduce function

HelloWorld show an example of how it works.
Fully tested existing aggregations. The generic method didn't perform as expected.


git-svn-id: https://hyracks.googlecode.com/svn/branches/fullstack_imru@2779 123451ca-8445-de46-9d55-352943316053
87 files changed
tree: 7f42a06e3deb63feadfb348d1e82eabfd535e2c2
  1. algebricks/
  2. hyracks/
  3. imru/
  4. pom.xml
  5. pregelix/