/*
* Copyright (c) 2007-2014 Concurrent, Inc. All Rights Reserved.
*
* Project and contact information: http://www.cascading.org/
*
* This file is part of the Cascading project.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cascading.lingual.optiq;
import org.eigenbase.rel.ProjectRel;
import org.eigenbase.relopt.RelOptRule;
import org.eigenbase.relopt.RelOptRuleCall;
import org.eigenbase.relopt.RelTraitSet;
/**
*
*/
class CascadingProjectRule extends RelOptRule
{
public static final CascadingProjectRule INSTANCE = new CascadingProjectRule();
private CascadingProjectRule()
{
super( any( ProjectRel.class ), "CascadingProjectRule" );
}
@Override
public void onMatch( RelOptRuleCall call )
{
ProjectRel rel = call.rel( 0 );
RelTraitSet newTraits = rel.getTraitSet().plus( Cascading.CONVENTION );
call.transformTo( new CascadingProjectRel(
rel.getCluster(),
newTraits,
convert( rel.getChild(), newTraits ),
rel.getProjects(),
rel.getRowType(),
rel.getFlags(),
rel.getCollationList() ) );
}
}