org.apache.calcite.plan.hep

Class HepRuleCall

java.lang.Object

org.apache.calcite.plan.RelOptRuleCall

org.apache.calcite.plan.hep.HepRuleCall

public class HepRuleCall
extends RelOptRuleCall

HepRuleCall implements RelOptRuleCall for a HepPlanner. It remembers transformation results so that the planner can choose which one (if any) should replace the original expression.

Field Summary

Fields

Modifier and Type	Field and Description
private List<RelNode>	results

Fields inherited from class org.apache.calcite.plan.RelOptRuleCall

id, LOGGER, nodeInputs, operand0, rels, rule

Constructor Summary

Constructors

Constructor and Description
HepRuleCall(RelOptPlanner planner, RelOptRuleOperand operand, RelNode[] rels, Map<RelNode,List<RelNode>> nodeChildren, List<RelNode> parents)

Method Summary

Modifier and Type	Method and Description
(package private) List<RelNode>	getResults()
void	transformTo(RelNode rel, Map<RelNode,RelNode> equiv) Registers that a rule has produced an equivalent relational expression.

Methods inherited from class org.apache.calcite.plan.RelOptRuleCall

builder, getChildRels, getMetadataQuery, getOperand0, getParents, getPlanner, getRelList, getRels, getRule, rel, setChildRels, transformTo

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

results

private List<RelNode> results

Constructor Detail

HepRuleCall

HepRuleCall(RelOptPlanner planner,
            RelOptRuleOperand operand,
            RelNode[] rels,
            Map<RelNode,List<RelNode>> nodeChildren,
            List<RelNode> parents)

Method Detail

transformTo

public void transformTo(RelNode rel,
                        Map<RelNode,RelNode> equiv)

Description copied from class: RelOptRuleCall

Registers that a rule has produced an equivalent relational expression.

Called by the rule whenever it finds a match. The implementation of this method guarantees that the original relational expression (that is, this.rels[0]) has its traits propagated to the new relational expression (rel) and its unregistered children. Any trait not specifically set in the RelTraitSet returned by rel.getTraits() will be copied from this.rels[0].getTraitSet().

Specified by:

transformTo in class RelOptRuleCall

Parameters:

rel - Relational expression equivalent to the root relational expression of the rule call, call.rels(0)

equiv - Map of other equivalences

getResults

List<RelNode> getResults()