Return an open StoreCostController for the conglomerate.
Return an open StoreCostController which can be used to ask about the estimated row counts and costs of ScanController and ConglomerateController operations, on the given conglomerate.
@param xact_manager The TransactionController under which this operation takes place.
@param rawtran raw transaction context in which scan is managed.
@return The open StoreCostController.
@exception StandardException Standard exception policy.
@see StoreCostController