commit 07edaaf4e186c7f4532e6840d78381f53c8d1bf4
author jarodwen <jarodwen@123451ca-8445-de46-9d55-352943316053> Sun Dec 11 15:15:02 2011 +0000
committer jarodwen <jarodwen@123451ca-8445-de46-9d55-352943316053> Sun Dec 11 15:15:02 2011 +0000
tree 81c348aa8a748979e82285471a34898dcc13167a
parent ab0220e176021ab994bc37baf6124b6458dd84db

Update issue #52: 

- rewrote the aggregator interface to create a state factory; 
- added a wrapper interface for aggregation and changed the original aggregators to be field aggregators, and added a multi-field aggregator wrapper;
- rewrote test cases for new interface; 
- added count field aggregator.

git-svn-id: https://hyracks.googlecode.com/svn/branches/aggregators_dev_next@879 123451ca-8445-de46-9d55-352943316053