public static class AbstractConverter.ExpandConversionRule extends RelRule<AbstractConverter.ExpandConversionRule.Config>
AbstractConverter 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).
| Modifier and Type | Class and Description |
|---|---|
static interface |
AbstractConverter.ExpandConversionRule.Config
Rule configuration.
|
RelRule.Done, RelRule.MatchHandler<R extends RelOptRule>, RelRule.OperandBuilder, RelRule.OperandDetailBuilder<R extends RelNode>, RelRule.OperandTransformRelOptRule.ConverterRelOptRuleOperand| Modifier and Type | Field and Description |
|---|---|
static AbstractConverter.ExpandConversionRule |
INSTANCE |
description, operands, relBuilderFactory| Modifier | Constructor and Description |
|---|---|
protected |
ExpandConversionRule(AbstractConverter.ExpandConversionRule.Config config)
Creates an ExpandConversionRule.
|
|
ExpandConversionRule(RelBuilderFactory relBuilderFactory)
Deprecated.
|
| Modifier and Type | Method and Description |
|---|---|
void |
onMatch(RelOptRuleCall call)
Receives notification about a rule match.
|
any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unorderedpublic static final AbstractConverter.ExpandConversionRule INSTANCE
protected ExpandConversionRule(AbstractConverter.ExpandConversionRule.Config config)
@Deprecated public ExpandConversionRule(RelBuilderFactory relBuilderFactory)
public void onMatch(RelOptRuleCall call)
RelOptRulecall.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.
onMatch in class RelOptRulecall - Rule callRelOptRule.matches(RelOptRuleCall)Copyright © 2012-2022 Apache Software Foundation. All Rights Reserved.