| /* |
| * 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.apache.calcite.rel.InvalidRelException; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.plan.RelOptCluster; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.rel.type.RelDataTypeField; |
| import org.apache.calcite.rel.type.RelDataTypeFieldImpl; |
| import org.apache.calcite.rel.type.RelRecordType; |
| import org.apache.calcite.rex.RexNode; |
| import org.apache.calcite.sql.type.SqlTypeName; |
| |
| import com.google.common.collect.Lists; |
| |
| /** |
| * Project implemented in Drill. |
| */ |
| public class DrillProjectRel extends DrillProjectRelBase implements DrillRel { |
| public DrillProjectRel(RelOptCluster cluster, RelTraitSet traits, RelNode child, List<? extends RexNode> exps, |
| RelDataType rowType) { |
| super(DRILL_LOGICAL, cluster, traits, child, exps, rowType); |
| } |
| |
| |
| @Override |
| public org.apache.calcite.rel.core.Project 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, getInput()); |
| 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)); |
| } |
| |
| /** provide a public method to create an instance of DrillProjectRel. |
| * |
| * @param cluster |
| * @param traits |
| * @param child |
| * @param exps |
| * @param rowType |
| * @return new instance of DrillProjectRel |
| */ |
| public static DrillProjectRel create(RelOptCluster cluster, RelTraitSet traits, RelNode child, List<? extends RexNode> exps, |
| RelDataType rowType) { |
| return new DrillProjectRel(cluster, traits, child, exps, rowType); |
| } |
| } |