org.apache.calcite.rel.rules

Class UnionMergeRule

java.lang.Object

org.apache.calcite.plan.RelOptRule

org.apache.calcite.rel.rules.UnionMergeRule

public class UnionMergeRule
extends RelOptRule

UnionMergeRule implements the rule for combining two non-distinct SetOps into a single SetOp.

Originally written for Union (hence the name), but now also applies to Intersect.

Field Summary

Fields

Modifier and Type	Field and Description
static UnionMergeRule	INSTANCE
static UnionMergeRule	INTERSECT_INSTANCE
static UnionMergeRule	MINUS_INSTANCE

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

description, operands, relBuilderFactory

Constructor Summary

Constructors

Constructor and Description
UnionMergeRule(Class<? extends SetOp> unionClazz, String description, RelBuilderFactory relBuilderFactory) Creates a UnionMergeRule.
UnionMergeRule(Class<? extends Union> unionClazz, RelFactories.SetOpFactory setOpFactory) Deprecated.

Method Summary

Modifier and Type	Method and 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, 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

INSTANCE

public static final UnionMergeRule INSTANCE

INTERSECT_INSTANCE

public static final UnionMergeRule INTERSECT_INSTANCE

MINUS_INSTANCE

public static final UnionMergeRule MINUS_INSTANCE

Constructor Detail

UnionMergeRule

public UnionMergeRule(Class<? extends SetOp> unionClazz,
                      String description,
                      RelBuilderFactory relBuilderFactory)

Creates a UnionMergeRule.

UnionMergeRule

@Deprecated
public UnionMergeRule(Class<? extends Union> unionClazz,
                                  RelFactories.SetOpFactory setOpFactory)

Deprecated.

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 class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)