/*
* 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.pipe.GroupBy;
import cascading.pipe.Pipe;
import cascading.pipe.assembly.Unique;
import cascading.tuple.Fields;
import org.eigenbase.rel.RelNode;
import org.eigenbase.rel.SetOpRel;
import org.eigenbase.rel.UnionRelBase;
import org.eigenbase.relopt.RelOptCluster;
import org.eigenbase.relopt.RelOptCost;
import org.eigenbase.relopt.RelOptPlanner;
import org.eigenbase.relopt.RelTraitSet;
/** Join implemented in Cascading. */
class CascadingUnionRel extends UnionRelBase implements CascadingRelNode
{
public CascadingUnionRel( RelOptCluster cluster, RelTraitSet traits, List<RelNode> inputs, boolean all )
{
super( cluster, traits, inputs, all );
}
@Override
public RelOptCost computeSelfCost( RelOptPlanner planner )
{
return super.computeSelfCost( planner ).multiplyBy( .1 );
}
// @Override
// public void explain( RelOptPlanWriter pw )
// {
// Yuck. Add a builder pattern so we can just call super.
// final List<String> nameList = new ArrayList<String>( Arrays.asList( "left", "right", "condition" ) );
// final List<Object> valueList = new ArrayList<Object>();
//
// nameList.add( "joinType" );
// valueList.add( joinType.name().toLowerCase() );
// nameList.add( "hash" );
// valueList.add( hash );
//
// if( !getSystemFieldList().isEmpty() )
// {
// nameList.add( "systemFields" );
// valueList.add( getSystemFieldList() );
// }
//
// pw.explain( this, nameList, valueList );
// }
@Override
public SetOpRel copy( RelTraitSet traitSet, List<RelNode> inputs, boolean all )
{
return new CascadingUnionRel( getCluster(), traitSet, inputs, all );
}
public Branch visitChild( Stack stack )
{
Pipe[] pipes = new Pipe[ inputs.size() ];
Branch[] branches = new Branch[ inputs.size() ];
for( int i = 0; i < inputs.size(); i++ )
{
branches[ i ] = ( (CascadingRelNode) inputs.get( i ) ).visitChild( stack );
pipes[ i ] = branches[ i ].current;
pipes[ i ] = stack.addDebug( this, pipes[ i ], i );
}
String name = stack.getNameFor( GroupBy.class, pipes );
Pipe pipe;
if( !all )
pipe = new Unique( name, pipes, Fields.ALL );
else
pipe = new GroupBy( name, pipes, Fields.ALL );
pipe = stack.addDebug( this, pipe );
return new Branch( pipe, branches );
}
}