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

id, LOGGER, rels, rule

Method Summary

Methods

Modifier and Type	Method and Description
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

getChildRels, getOperand0, getParents, getPlanner, getRelList, getRels, getRule, rel, transformTo

Methods inherited from class java.lang.Object

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

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