madlib/madlib — pull request #290 by aojwang (2012-12-20 08:59:30+00:00)
Title: Improve the performance of Apriori by using compressed bitmap rather tha...

Improve the performance of Apriori by using compressed bitmap rather sparse vector (this PR must be merged after PR-289, which is about compressed bitmap).

JIRA: MADLIB-771.
Replace the svec to compressed bitmap and remove some unnecessary columns from the tables.