org.eigenbase.rel.rules
Class MergeFilterRule

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

public class MergeFilterRule
extends RelOptRule

MergeFilterRule implements the rule for combining two FilterRels

Version:

$Id: //open/dev/farrago/src/org/eigenbase/rel/rules/MergeFilterRule.java#8 $

Author:

Zelaine Fong

Field Summary

static MergeFilterRule

instance

Fields inherited from class org.eigenbase.relopt.RelOptRule

ANY, description, operands

Constructor Summary

private

MergeFilterRule() Creates a MergeFilterRule.

Method Summary

private RexProgram	createProgram(FilterRel filterRel) Creates a RexProgram corresponding to a FilterRel
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 MergeFilterRule instance

Constructor Detail

MergeFilterRule

private MergeFilterRule()

Creates a MergeFilterRule.

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)

createProgram

private RexProgram createProgram(FilterRel filterRel)

Creates a RexProgram corresponding to a FilterRel

Parameters:

filterRel - the FilterRel

Returns:

created RexProgram