cost

[Jocean shi]

Hi:

I define some rules, and the cost method of my RelNode is

@Override
public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) {
    return super.computeSelfCost(planner, mq).multiplyBy(.1);
}

The result of this method is aways infinity.

why? , and How do volcano calculate cost?


Best

Jocean.shi