Package 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
@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.
Example
Original query:
SELECT job FROM "scott".emp WHERE deptno = 10
INTERSECT
SELECT job FROM "scott".emp WHERE deptno = 20
Query after conversion:
SELECT job
FROM (
SELECT job, 0 AS i FROM "scott".emp WHERE deptno = 10
UNION ALL
SELECT job, 1 AS i FROM "scott".emp WHERE deptno = 20
)
GROUP BY job
HAVING COUNT(*) FILTER (WHERE i = 0) > 0
AND COUNT(*) FILTER (WHERE i = 1) > 0
-
Nested Class Summary
Nested ClassesModifier and TypeClassDescriptionstatic interface
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.RelOptRule
description, operands, relBuilderFactory
-
Constructor Summary
ConstructorsModifierConstructorDescriptionIntersectToDistinctRule
(Class<? extends Intersect> intersectClass, RelBuilderFactory relBuilderFactory) Deprecated.protected
Creates an IntersectToDistinctRule. -
Method Summary
Modifier and TypeMethodDescriptionvoid
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
-
Constructor Details
-
IntersectToDistinctRule
Creates an IntersectToDistinctRule. -
IntersectToDistinctRule
@Deprecated public IntersectToDistinctRule(Class<? extends Intersect> intersectClass, RelBuilderFactory relBuilderFactory) Deprecated.
-
-
Method Details
-
onMatch
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 classRelOptRule
- Parameters:
call
- Rule call- See Also:
-