Package org.apache.calcite.rel.rules
Class AbstractJoinExtractFilterRule
- java.lang.Object
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- org.apache.calcite.plan.RelOptRule
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- org.apache.calcite.rel.rules.AbstractJoinExtractFilterRule
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- Direct Known Subclasses:
JoinExtractFilterRule
public abstract class AbstractJoinExtractFilterRule extends RelOptRule
Rule to convert aninner join
to afilter
on top of acartesian inner join
.One benefit of this transformation is that after it, the join condition can be combined with conditions and expressions above the join. It also makes the
FennelCartesianJoinRule
applicable.The constructor is parameterized to allow any sub-class of
Join
.
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Field Summary
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Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
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Constructor Summary
Constructors Modifier Constructor Description protected
AbstractJoinExtractFilterRule(RelOptRuleOperand operand, RelBuilderFactory relBuilderFactory, java.lang.String description)
Creates an AbstractJoinExtractFilterRule.
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Method Summary
All Methods Instance Methods Concrete Methods 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, 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 Detail
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AbstractJoinExtractFilterRule
protected AbstractJoinExtractFilterRule(RelOptRuleOperand operand, RelBuilderFactory relBuilderFactory, java.lang.String description)
Creates an AbstractJoinExtractFilterRule.
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Method Detail
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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 classRelOptRule
- Parameters:
call
- Rule call- See Also:
RelOptRule.matches(RelOptRuleCall)
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