/**
* Creates a <code>VolcanoRuleMatch</code>.
*
* @param operand0 Primary operand
* @param rels List of targets; copied by the constructor, so the client can modify it later
* @pre rels[i] != null
*/
VolcanoRuleMatch(VolcanoPlanner volcanoPlanner, RelOptRuleOperand operand0, RelNode[] rels) {
super(volcanoPlanner, operand0, rels.clone());
this.volcanoPlanner = volcanoPlanner;
for (int i = 0; i < rels.length; i++) {
assert rels[i] != null;
}
// Try to deduce which subset the result will belong to. Assume --
// for now -- that the set is the same as the root relexp.
targetSet = volcanoPlanner.getSet(rels[0]);
assert targetSet != null : rels[0].toString() + " isn't in a set";
digest = computeDigest();
}
