Class AbstractConverter.ExpandConversionRule
- java.lang.Object
-
- org.apache.calcite.plan.RelOptRule
-
- org.apache.calcite.plan.volcano.AbstractConverter.ExpandConversionRule
-
- Enclosing class:
- AbstractConverter
public static class AbstractConverter.ExpandConversionRule extends RelOptRule
Rule which converts anAbstractConverter
into a chain of converters from the source relation to the target traits.The chain produced is minimal: we have previously built the transitive closure of the graph of conversions, so we choose the shortest chain.
Unlike the
AbstractConverter
they are replacing, these converters are guaranteed to be able to convert any relation of their calling convention. Furthermore, because they introduce subsets of other calling conventions along the way, these subsets may spawn more efficient conversions which are not generally applicable.AbstractConverters can be messy, so they restrain themselves: they don't fire if the target subset already has an implementation (with less than infinite cost).
-
-
Field Summary
Fields Modifier and Type Field Description static AbstractConverter.ExpandConversionRule
INSTANCE
-
Fields inherited from class org.apache.calcite.plan.RelOptRule
description, operands, relBuilderFactory
-
-
Constructor Summary
Constructors Constructor Description ExpandConversionRule(RelBuilderFactory relBuilderFactory)
Creates an ExpandConversionRule.
-
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
-
-
-
-
Field Detail
-
INSTANCE
public static final AbstractConverter.ExpandConversionRule INSTANCE
-
-
Constructor Detail
-
ExpandConversionRule
public ExpandConversionRule(RelBuilderFactory relBuilderFactory)
Creates an ExpandConversionRule.- Parameters:
relBuilderFactory
- Builder for relational expressions
-
-
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>)
to register the expression.- Specified by:
onMatch
in classRelOptRule
- Parameters:
call
- Rule call- See Also:
RelOptRule.matches(RelOptRuleCall)
-
-