/*
* 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 java.util.List;
import cascading.lingual.optiq.meta.Branch;
import cascading.tuple.Fields;
import org.eigenbase.rel.RelNode;
import org.eigenbase.rel.ValuesRelBase;
import org.eigenbase.relopt.RelOptCluster;
import org.eigenbase.relopt.RelTraitSet;
import org.eigenbase.reltype.RelDataType;
import org.eigenbase.rex.RexLiteral;
import static cascading.lingual.util.Misc.createUniqueName;
/**
* Implementation of VALUES operator, that returns a constant set of tuples,
* in Cascading convention.
*/
class CascadingValuesRel extends ValuesRelBase implements CascadingRelNode
{
public CascadingValuesRel(
RelOptCluster cluster,
RelTraitSet traits,
RelDataType rowType,
List<List<RexLiteral>> tuples )
{
super( cluster, rowType, tuples, traits );
assert traits.contains( Cascading.CONVENTION );
}
@Override
public RelNode copy( RelTraitSet traitSet, List<RelNode> inputs )
{
assert inputs.isEmpty();
return new CascadingValuesRel( getCluster(), traitSet, rowType, tuples );
}
public Branch visitChild( Stack stack )
{
String pipeName = createUniqueName();
Fields fields = RelUtil.createTypedFieldsFor( this, false );
return new Branch( stack.heads, pipeName, fields, tuples );
}
}