Improved futile_union_intersection_subtraction in case of A-A, when A is a sub-query
git-svn-id: http://galileo.dmi.unict.it/svn/relational/trunk@208 014f5005-505e-4b48-8d0a-63407b615a7cmaster
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9efc56269e
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1d6aa88805
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