private double calculateLevelMaterializationTime(Level level) {
// the materialization cost in the level, it is the cost
// to materialize the last operator in the level.
// it is calculated by getting the cardinality
// from the estimator and then calculate the cost
// of writing each record on the memory depending
// in the memory write speed. (materialization in table memory)
int levelLength = level.getSubQquery().size();
double levelMaterializationRunTime = 0.0;
levelMaterializationRunTime =
level.getSubQquery().get(levelLength - 1).getOpMaterializationTimeEstimate();
return levelMaterializationRunTime;
}
private double calculateLevelRuntinme(Level level) {
List<CostModelOperator> ops = level.getSubQquery();
// sum-up all operators runtime in one level
// TODO: using a cost model for estimate or
// using the database cost estimator.
double levelRunTime = 0.0;
for (CostModelOperator op : ops) {
levelRunTime += op.getOpRunTimeEstimate();
}
return levelRunTime;
}
