relational

Author	SHA1	Message	Date
LtWorf	71697bb2e8	- Implemented select_union_intersect_subtract general optimization - Added tests for the new optimization git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@268 014f5005-505e-4b48-8d0a-63407b615a7c	2011-02-18 18:11:39 +07:00