/*
* 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.rel.RelNode;
import org.eigenbase.rel.convert.ConverterRule;
import org.eigenbase.relopt.Convention;
import static cascading.lingual.optiq.Cascading.CONVENTION;
/**
*
*/
class CascadingProjectConverterRule extends ConverterRule
{
public static final CascadingProjectConverterRule INSTANCE = new CascadingProjectConverterRule();
public CascadingProjectConverterRule()
{
super( ProjectRel.class, Convention.NONE, CONVENTION, "CascadingProjectConverterRule" );
}
@Override
public RelNode convert( RelNode rel )
{
// stolen from JavaRules.EnumerableAggregateRule
ProjectRel project = (ProjectRel) rel;
RelNode convertedChild = convert( project.getChild(), project.getTraitSet().replace( CONVENTION ) );
if( convertedChild == null )
return null; // We can't convert the child, so we can't convert rel.
// return new CascadingProjectRel( rel.getCluster(), rel.getTraitSet(), convertedChild, project.getGroupSet(), project.getAggCallList() );
return new CascadingProjectRel( rel.getCluster(),
rel.getTraitSet(),
convertedChild,
project.getProjects(),
project.getRowType(),
project.getFlags(),
project.getCollationList() );
}
}