> On Mar 6, 2016, at 9:37 PM, James K. Lowden <jklowden at schemamania.org> > wrote: > > I've never seen a system that provides queryable optimizer metadata.
Oracle does, for a given definition of ? queryable?. > I don't remember ever having read a paper on the idea, either. I have to confess using query plans to get free-form (facetted searches) query estimate *before* deciding to run them or not :D
