| /* |
| * 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.solr.handler.sql; |
| |
| import org.apache.calcite.plan.RelOptCluster; |
| import org.apache.calcite.plan.RelOptCost; |
| import org.apache.calcite.plan.RelOptPlanner; |
| import org.apache.calcite.plan.RelTraitSet; |
| import org.apache.calcite.rel.RelCollation; |
| import org.apache.calcite.rel.RelFieldCollation; |
| import org.apache.calcite.rel.RelNode; |
| import org.apache.calcite.rel.core.Sort; |
| import org.apache.calcite.rel.metadata.RelMetadataQuery; |
| import org.apache.calcite.rel.type.RelDataTypeField; |
| import org.apache.calcite.rex.RexLiteral; |
| import org.apache.calcite.rex.RexNode; |
| |
| import java.util.List; |
| |
| /** |
| * Implementation of {@link org.apache.calcite.rel.core.Sort} relational expression in Solr. |
| */ |
| class SolrSort extends Sort implements SolrRel { |
| |
| SolrSort(RelOptCluster cluster, RelTraitSet traitSet, RelNode child, RelCollation collation, RexNode offset, |
| RexNode fetch) { |
| super(cluster, traitSet, child, collation, offset, fetch); |
| |
| assert getConvention() == SolrRel.CONVENTION; |
| assert getConvention() == child.getConvention(); |
| } |
| |
| @Override |
| public RelOptCost computeSelfCost(RelOptPlanner planner, RelMetadataQuery mq) { |
| return planner.getCostFactory().makeZeroCost(); |
| } |
| |
| @Override |
| public Sort copy(RelTraitSet traitSet, RelNode input, RelCollation newCollation, RexNode offset, RexNode fetch) { |
| return new SolrSort(getCluster(), traitSet, input, collation, offset, fetch); |
| } |
| |
| public void implement(Implementor implementor) { |
| implementor.visitChild(0, getInput()); |
| |
| List<RelFieldCollation> sortCollations = collation.getFieldCollations(); |
| if (!sortCollations.isEmpty()) { |
| // Construct a series of order clauses from the desired collation |
| final List<RelDataTypeField> fields = getRowType().getFieldList(); |
| for (RelFieldCollation fieldCollation : sortCollations) { |
| final String name = fields.get(fieldCollation.getFieldIndex()).getName(); |
| String direction = "asc"; |
| if (fieldCollation.getDirection().equals(RelFieldCollation.Direction.DESCENDING)) { |
| direction = "desc"; |
| } |
| implementor.addOrder(name, direction); |
| } |
| } |
| |
| |
| if(fetch != null) { |
| implementor.setLimit(((RexLiteral) fetch).getValue().toString()); |
| } |
| } |
| } |