/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.drill.optiq;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.eigenbase.rel.FilterRelBase;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.*;
import org.eigenbase.rex.RexNode;
import java.util.List;
/**
* Filter implemented in Drill.
*/
public class DrillFilterRel extends FilterRelBase implements DrillRel {
protected DrillFilterRel(RelOptCluster cluster, RelTraitSet traits, RelNode child, RexNode condition) {
super(cluster, traits, child, condition);
assert getConvention() == CONVENTION;
}
@Override
public RelNode copy(RelTraitSet traitSet, List<RelNode> inputs) {
return new DrillFilterRel(getCluster(), traitSet, sole(inputs), getCondition());
}
@Override
public RelOptCost computeSelfCost(RelOptPlanner planner) {
return super.computeSelfCost(planner).multiplyBy(0.1);
}
@Override
public int implement(DrillImplementor implementor) {
final int inputId = implementor.visitChild(this, 0, getChild());
final ObjectNode filter = implementor.mapper.createObjectNode();
/*
* E.g. { op: "filter", expr: "donuts.ppu < 1.00" }
*/
filter.put("op", "filter");
filter.put("input", inputId);
filter.put("expr", DrillOptiq.toDrill(getChild(), getCondition()));
return implementor.add(filter);
}
}