Package org.apache.calcite.rel.convert
Class TraitMatchingRule
- java.lang.Object
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- org.apache.calcite.plan.RelOptRule
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- org.apache.calcite.rel.convert.TraitMatchingRule
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public class TraitMatchingRule extends RelOptRule
TraitMatchingRule adapts a converter rule, restricting it to fire only when its input already matches the expected output trait. This can be used withHepPlanner
in cases where alternate implementations are available and it is desirable to minimize converters.
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Field Summary
Fields Modifier and Type Field Description private ConverterRule
converter
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Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
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Constructor Summary
Constructors Constructor Description TraitMatchingRule(ConverterRule converterRule)
Deprecated.TraitMatchingRule(ConverterRule converterRule, RelBuilderFactory relBuilderFactory)
Creates a TraitMatchingRule.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description Convention
getOutConvention()
Returns the convention of the result of firing this rule, null if not known.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, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered
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Field Detail
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converter
private final ConverterRule converter
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Constructor Detail
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TraitMatchingRule
@Deprecated public TraitMatchingRule(ConverterRule converterRule)
Deprecated.
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TraitMatchingRule
public TraitMatchingRule(ConverterRule converterRule, RelBuilderFactory relBuilderFactory)
Creates a TraitMatchingRule.- Parameters:
converterRule
- Rule to be restricted; rule must take a single operand expecting a single inputrelBuilderFactory
- Builder for relational expressions
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Method Detail
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getOutConvention
public Convention getOutConvention()
Description copied from class:RelOptRule
Returns the convention of the result of firing this rule, null if not known.- Overrides:
getOutConvention
in classRelOptRule
- Returns:
- Convention of the result of firing this rule, null if not known
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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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