org.eigenbase.rel.rules
Class PullUpAggregateAboveUnionRule

java.lang.Object
  org.eigenbase.relopt.RelOptRule
      org.eigenbase.rel.rules.PullUpAggregateAboveUnionRule

public class PullUpAggregateAboveUnionRule
extends RelOptRule

PullUpAggregateAboveUnionRule implements the rule for pulling AggregateRels beneath a UnionRel so two AggregateRels that are used to remove duplicates can be combined into a single AggregateRel.

This rule only handles cases where the UnionRels still have only two inputs.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/rules/PullUpAggregateAboveUnionRule.java#7 $

Author:

Zelaine Fong

Field Summary

static PullUpAggregateAboveUnionRule

instance

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

private

PullUpAggregateAboveUnionRule() Creates a PullUpAggregateAboveUnionRule.

Method Summary

void	onMatch(RelOptRuleCall call) Receives notification about a rule match.

Methods inherited from class org.eigenbase.relopt.RelOptRule

convert, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, mergeTraitsAndConvert, mergeTraitsAndConvert, toString

Methods inherited from class java.lang.Object

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

Field Detail

instance

public static final PullUpAggregateAboveUnionRule instance

Constructor Detail

PullUpAggregateAboveUnionRule

private PullUpAggregateAboveUnionRule()

Creates a PullUpAggregateAboveUnionRule.

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.eigenbase.rel.RelNode) to register the expression.

Specified by:

onMatch in class RelOptRule

Parameters:

call - Rule call

See Also:

RelOptRule.matches(RelOptRuleCall)