Package org.apache.calcite.rel.rules
Class ExpandDisjunctionForJoinInputsRule
java.lang.Object
org.apache.calcite.plan.RelOptRule
org.apache.calcite.plan.RelRule<ExpandDisjunctionForJoinInputsRule.Config>
org.apache.calcite.rel.rules.ExpandDisjunctionForJoinInputsRule
- All Implemented Interfaces:
TransformationRule
@Enclosing
public class ExpandDisjunctionForJoinInputsRule
extends RelRule<ExpandDisjunctionForJoinInputsRule.Config>
implements TransformationRule
Rule to expand disjunction for join inputs in condition of a
Filter
or Join
.
For example:
select t1.id from t1, t2, t3 where t1.id = t2.id and t1.id = t3.id and ( (t1.age < 50 and t3.age > 20) or (t2.weight > 70 and t3.height < 180) )
we can expand to obtain the condition
select t1.id from t1, t2, t3 where t1.id = t2.id and t1.id = t3.id and ( (t1.age < 50 and t3.age > 20) or (t2.weight > 70 and t3.height < 180) ) and (t1.age < 50 or t2.weight > 70) and (t3.age > 20 or t3.height < 180)
new generated predicates are redundant, but they could be pushed down to join inputs([t1, t2], [t3]) and reduce the cardinality.
Note: This rule is similar to the ExpandDisjunctionForTableRule
,
but this rule divides the predicates by Join inputs.
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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
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Field Summary
Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
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Constructor Summary
ConstructorsModifierConstructorDescriptionprotected
Creates a ExpandDisjunctionForJoinInputsRule. -
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
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Constructor Details
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ExpandDisjunctionForJoinInputsRule
Creates a ExpandDisjunctionForJoinInputsRule.
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Method Details
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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:
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