Package org.apache.calcite.adapter.cassandra

Class CassandraRules.CassandraLimitRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.plan.RelRule<CassandraRules.CassandraLimitRule.CassandraLimitRuleConfig>

org.apache.calcite.adapter.cassandra.CassandraRules.CassandraLimitRule

Enclosing class:

CassandraRules

public static class CassandraRules.CassandraLimitRule
extends RelRule<CassandraRules.CassandraLimitRule.CassandraLimitRuleConfig>

Rule to convert a EnumerableLimit to a CassandraLimit.

See Also:

• CassandraRules.LIMIT

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	CassandraRules.CassandraLimitRule.CassandraLimitRuleConfig	Rule configuration.
static interface	CassandraRules.CassandraLimitRule.Config	Deprecated.

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

Field Summary

Fields inherited from class org.apache.calcite.plan.RelRule

config

Fields inherited from class org.apache.calcite.plan.RelOptRule

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	CassandraLimitRule(CassandraRules.CassandraLimitRule.CassandraLimitRuleConfig config)	Creates a CassandraLimitRule.

Method Summary

Modifier and Type	Method	Description
RelNode	convert(EnumerableLimit limit)
void	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

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Details

CassandraLimitRule

protected CassandraLimitRule(CassandraRules.CassandraLimitRule.CassandraLimitRuleConfig config)

Creates a CassandraLimitRule.

Method Details

convert

public RelNode convert(EnumerableLimit limit)

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>, org.apache.calcite.plan.RelHintsPropagator) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

• RelOptRule.matches(RelOptRuleCall)