org.apache.calcite.rel.rules

Class AggregateStarTableRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.AggregateStarTableRule

public class AggregateStarTableRule
extends RelOptRule

Planner rule that matches an Aggregate on top of a StarTable.StarTableScan.

This pattern indicates that an aggregate table may exist. The rule asks the star table for an aggregate table at the required level of aggregation.

Field Summary

Fields

Modifier and Type	Field and Description
static AggregateStarTableRule	INSTANCE
static AggregateStarTableRule	INSTANCE2

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

description, operands

Method Summary

Methods

Modifier and Type	Method and Description
protected void	apply(RelOptRuleCall call, Project postProject, Aggregate aggregate, StarTable.StarTableScan scan)
void	onMatch(RelOptRuleCall call) Receives notification about a rule match.

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

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

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final AggregateStarTableRule INSTANCE

INSTANCE2

public static final AggregateStarTableRule INSTANCE2

Method Detail

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>) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)

apply

protected void apply(RelOptRuleCall call,
         Project postProject,
         Aggregate aggregate,
         StarTable.StarTableScan scan)