julianhyde/optiq — pull request #123 by hbutani (2014-01-24 02:57:25+00:00)
Title: remove references to VolcanoCost from RelSubset

This enables us to use a different RelOptCost(we are experimenting with
HiveCost).
Currently we are also extending VolcanoPlanner to override cost
functions. As discussed long term may be better to have a separate
entity for cost functions.