| /* |
| * 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.iotdb.db.queryengine.plan.expression.visitor; |
| |
| import org.apache.iotdb.commons.path.PartialPath; |
| import org.apache.iotdb.db.queryengine.plan.expression.Expression; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.NullOperand; |
| import org.apache.iotdb.db.queryengine.plan.expression.leaf.TimeSeriesOperand; |
| import org.apache.iotdb.tsfile.write.schema.IMeasurementSchema; |
| |
| import java.util.Map; |
| |
| /** |
| * This class is only used for align by device query with template and value filter. |
| * |
| * <p>The function of this class is used to remove timeseries which is not in the template. |
| */ |
| public class TemplatedConcatRemoveUnExistentMeasurementVisitor |
| extends ReconstructVisitor<Map<String, IMeasurementSchema>> { |
| |
| @Override |
| public Expression visitTimeSeriesOperand( |
| TimeSeriesOperand predicate, Map<String, IMeasurementSchema> context) { |
| PartialPath measurementPath = predicate.getPath(); |
| if (context.containsKey(measurementPath.getMeasurement())) { |
| return predicate; |
| } else { |
| return new NullOperand(); |
| } |
| } |
| } |