public Cost findLocalCost(ICatalog catalog, LogicalProperty[] inputLogProp) {
// XXX vpapad: really naive. Only considers the hashing cost
float inpCard = inputLogProp[0].getCardinality();
float outputCard = logProp.getCardinality();
double cost = inpCard * catalog.getDouble("tuple_reading_cost");
cost += inpCard * catalog.getDouble("tuple_hashing_cost");
cost += outputCard * catalog.getDouble("tuple_construction_cost");
return new Cost(cost);
}
/**
* @see niagara.optimizer.colombia.PhysicalOp#FindLocalCost(ICatalog, LogicalProperty,
* LogicalProperty[])
*/
public Cost findLocalCost(ICatalog catalog, LogicalProperty[] InputLogProp) {
// XXX vpapad: totally bogus flat cost for stream scans
return new Cost(catalog.getDouble("stream_scan_cost"));
}
