Package org.apache.calcite.rel.rules

Class LoptOptimizeJoinRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<LoptOptimizeJoinRule.Config>

org.apache.calcite.rel.rules.LoptOptimizeJoinRule

All Implemented Interfaces:

TransformationRule

@Enclosing
public class LoptOptimizeJoinRule
extends RelRule<LoptOptimizeJoinRule.Config>
implements TransformationRule

Planner rule that implements the heuristic planner for determining optimal join orderings.

It is triggered by the pattern LogicalProject (MultiJoin).

See Also:

• CoreRules.MULTI_JOIN_OPTIMIZE

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	LoptOptimizeJoinRule.Config	Rule configuration.

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelRule

RelRule.Done, RelRule.MatchHandler<R extends RelOptRule>, RelRule.OperandBuilder, RelRule.OperandDetailBuilder<R extends RelNode>, RelRule.OperandTransform

Nested classes/interfaces inherited from class org.apache.calcite.plan.RelOptRule

RelOptRule.ConverterRelOptRuleOperand

Field Summary

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

config

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
	LoptOptimizeJoinRule(RelFactories.JoinFactory joinFactory, RelFactories.ProjectFactory projectFactory, RelFactories.FilterFactory filterFactory)	Deprecated.
protected	LoptOptimizeJoinRule(LoptOptimizeJoinRule.Config config)	Creates an LoptOptimizeJoinRule.
	LoptOptimizeJoinRule(RelBuilderFactory relBuilderFactory)	Deprecated.

Method Summary

Modifier and Type	Method	Description
static boolean	isRemovableSelfJoin(Join joinRel)	Determines whether a join is a removable self-join.
void	onMatch(RelOptRuleCall call)	Receives notification about a rule match.

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

any, convert, convert, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

LoptOptimizeJoinRule

protected LoptOptimizeJoinRule(LoptOptimizeJoinRule.Config config)

Creates an LoptOptimizeJoinRule.

LoptOptimizeJoinRule

@Deprecated
public LoptOptimizeJoinRule(RelBuilderFactory relBuilderFactory)

Deprecated.

LoptOptimizeJoinRule

@Deprecated
public LoptOptimizeJoinRule(RelFactories.JoinFactory joinFactory,
 RelFactories.ProjectFactory projectFactory,
 RelFactories.FilterFactory filterFactory)

Deprecated.

Method Details

onMatch

public void onMatch(RelOptRuleCall call)

Description copied from class: RelOptRule

Receives notification about a rule match. At the time that this method is called, call.rels holds the set of relational expressions which match the operands to the rule; call.rels[0] is the root expression.

Typically a rule would check that the nodes are valid matches, creates a new expression, then calls back RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>, org.apache.calcite.plan.RelHintsPropagator) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

• RelOptRule.matches(RelOptRuleCall)

isRemovableSelfJoin

public static boolean isRemovableSelfJoin(Join joinRel)

Determines whether a join is a removable self-join. It is if it's an inner join between identical, simple factors and the equality portion of the join condition consists of the same set of unique keys.

Parameters:

joinRel - the join

Returns:

true if the join is removable