org.apache.calcite.rel.rules

Class SemiJoinRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.SemiJoinRule

Direct Known Subclasses:

SemiJoinRule.JoinToSemiJoinRule, SemiJoinRule.ProjectToSemiJoinRule

public abstract class SemiJoinRule
extends RelOptRule

Planner rule that creates a SemiJoinRule from a Join on top of a LogicalAggregate.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SemiJoinRule.JoinToSemiJoinRule SemiJoinRule that matches a Join with an empty Aggregate as its right child.
static class	SemiJoinRule.ProjectToSemiJoinRule SemiJoinRule that matches a Project on top of a Join with an Aggregate as its right child.

Field Summary

Fields

Modifier and Type	Field and Description
private static com.google.common.base.Predicate<Aggregate>	IS_EMPTY_AGGREGATE
private static com.google.common.base.Predicate<Join>	IS_LEFT_OR_INNER
static SemiJoinRule	JOIN
static SemiJoinRule	PROJECT

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	SemiJoinRule(Class<Join> joinClass, Class<Aggregate> aggregateClass, RelBuilderFactory relBuilderFactory, String description)
protected	SemiJoinRule(Class<Project> projectClass, Class<Join> joinClass, Class<Aggregate> aggregateClass, RelBuilderFactory relBuilderFactory, String description)

Method Summary

Modifier and Type	Method and Description
void	onMatch(RelOptRuleCall call) Receives notification about a rule match.
protected void	perform(RelOptRuleCall call, Project project, Join join, RelNode left, Aggregate aggregate)

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

any, convert, convert, convertList, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, some, toString, unordered

Methods inherited from class java.lang.Object

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

Field Detail

IS_LEFT_OR_INNER

private static final com.google.common.base.Predicate<Join> IS_LEFT_OR_INNER

IS_EMPTY_AGGREGATE

private static final com.google.common.base.Predicate<Aggregate> IS_EMPTY_AGGREGATE

PROJECT

public static final SemiJoinRule PROJECT

JOIN

public static final SemiJoinRule JOIN

Constructor Detail

SemiJoinRule

protected SemiJoinRule(Class<Project> projectClass,
                       Class<Join> joinClass,
                       Class<Aggregate> aggregateClass,
                       RelBuilderFactory relBuilderFactory,
                       String description)

SemiJoinRule

protected SemiJoinRule(Class<Join> joinClass,
                       Class<Aggregate> aggregateClass,
                       RelBuilderFactory relBuilderFactory,
                       String description)

Method Detail

perform

protected void perform(RelOptRuleCall call,
                       Project project,
                       Join join,
                       RelNode left,
                       Aggregate aggregate)

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 class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)