Package org.apache.calcite.rel.rules

Class JoinPushExpressionsRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.calcite.rel.rules.JoinPushExpressionsRule

All Implemented Interfaces:

TransformationRule

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

Planner rule that pushes down expressions in "equal" join condition.

For example, given "emp JOIN dept ON emp.deptno + 1 = dept.deptno", adds a project above "emp" that computes the expression "emp.deptno + 1". The resulting join condition is a simple combination of AND, equals, and input fields, plus the remaining non-equal conditions.

See Also:

• CoreRules.JOIN_PUSH_EXPRESSIONS

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	JoinPushExpressionsRule.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
	JoinPushExpressionsRule(Class<? extends Join> joinClass, RelFactories.ProjectFactory projectFactory)	Deprecated.
	JoinPushExpressionsRule(Class<? extends Join> joinClass, RelBuilderFactory relBuilderFactory)	Deprecated.
protected	JoinPushExpressionsRule(JoinPushExpressionsRule.Config config)	Creates a JoinPushExpressionsRule.

Method Summary

Modifier and Type	Method	Description
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

JoinPushExpressionsRule

protected JoinPushExpressionsRule(JoinPushExpressionsRule.Config config)

Creates a JoinPushExpressionsRule.

JoinPushExpressionsRule

@Deprecated
public JoinPushExpressionsRule(Class<? extends Join> joinClass,
 RelBuilderFactory relBuilderFactory)

Deprecated.

JoinPushExpressionsRule

@Deprecated
public JoinPushExpressionsRule(Class<? extends Join> joinClass,
 RelFactories.ProjectFactory projectFactory)

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)