org.apache.calcite.rel.rules

Class IntersectToDistinctRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

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

org.apache.calcite.rel.rules.IntersectToDistinctRule

All Implemented Interfaces:

TransformationRule

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

Planner rule that translates a distinct Intersect (all = false) into a group of operators composed of Union, Aggregate, etc.

Rewrite: (GB-Union All-GB)-GB-UDTF (on all attributes)

Example

Query: R1 Intersect All R2

R3 = GB(R1 on all attributes, count(*) as c)
union all
GB(R2 on all attributes, count(*) as c)

R4 = GB(R3 on all attributes, count(c) as cnt, min(c) as m)

Note that we do not need min(c) in intersect distinct.

R5 = Filter(cnt == #branch)

If it is intersect all then

R6 = UDTF (R5) which will explode the tuples based on min(c)
R7 = Project(R6 on all attributes)

Else

R6 = Proj(R5 on all attributes)

See Also:

UnionToDistinctRule, CoreRules.INTERSECT_TO_DISTINCT

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	IntersectToDistinctRule.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 and Description
	IntersectToDistinctRule(Class<? extends Intersect> intersectClass, RelBuilderFactory relBuilderFactory) Deprecated.
protected	IntersectToDistinctRule(IntersectToDistinctRule.Config config) Creates an IntersectToDistinctRule.

Method Summary

Modifier and Type	Method and Description
void	onMatch(RelOptRuleCall call) Receives notification about a rule match.

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

any, 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 Detail

IntersectToDistinctRule

protected IntersectToDistinctRule(IntersectToDistinctRule.Config config)

Creates an IntersectToDistinctRule.

IntersectToDistinctRule

@Deprecated
public IntersectToDistinctRule(Class<? extends Intersect> intersectClass,
                                           RelBuilderFactory relBuilderFactory)

Deprecated.

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>, org.apache.calcite.plan.RelHintsPropagator) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)