/**
* 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.exec.planner.logical;
import java.util.List;
import org.apache.drill.common.logical.data.LogicalOperator;
import org.apache.drill.common.logical.data.NamedExpression;
import org.apache.drill.common.logical.data.Project;
import org.apache.drill.exec.planner.common.DrillProjectRelBase;
import org.apache.drill.exec.planner.torel.ConversionContext;
import org.eigenbase.rel.InvalidRelException;
import org.eigenbase.rel.ProjectRelBase;
import org.eigenbase.rel.RelNode;
import org.eigenbase.relopt.RelOptCluster;
import org.eigenbase.relopt.RelTraitSet;
import org.eigenbase.reltype.RelDataType;
import org.eigenbase.reltype.RelDataTypeField;
import org.eigenbase.reltype.RelDataTypeFieldImpl;
import org.eigenbase.reltype.RelRecordType;
import org.eigenbase.rex.RexNode;
import org.eigenbase.sql.type.SqlTypeName;
import com.google.common.collect.Lists;
/**
* Project implemented in Drill.
*/
public class DrillProjectRel extends DrillProjectRelBase implements DrillRel {
protected DrillProjectRel(RelOptCluster cluster, RelTraitSet traits, RelNode child, List<RexNode> exps,
RelDataType rowType) {
super(DRILL_LOGICAL, cluster, traits, child, exps, rowType);
}
public ProjectRelBase copy(RelTraitSet traitSet, RelNode input, List<RexNode> exps, RelDataType rowType) {
return new DrillProjectRel(getCluster(), traitSet, input, exps, rowType);
}
@Override
public LogicalOperator implement(DrillImplementor implementor) {
LogicalOperator inputOp = implementor.visitChild(this, 0, getChild());
Project.Builder builder = Project.builder();
builder.setInput(inputOp);
for (NamedExpression e: this.getProjectExpressions(implementor.getContext())) {
builder.addExpr(e);
}
return builder.build();
}
public static DrillProjectRel convert(Project project, ConversionContext context) throws InvalidRelException{
RelNode input = context.toRel(project.getInput());
List<RelDataTypeField> fields = Lists.newArrayList();
List<RexNode> exps = Lists.newArrayList();
for(NamedExpression expr : project.getSelections()){
fields.add(new RelDataTypeFieldImpl(expr.getRef().getRootSegment().getPath(), fields.size(), context.getTypeFactory().createSqlType(SqlTypeName.ANY) ));
exps.add(context.toRex(expr.getExpr()));
}
return new DrillProjectRel(context.getCluster(), context.getLogicalTraits(), input, exps, new RelRecordType(fields));
}
}