iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/expression/visitor/ReplaceSubTreeWithViewVisitor.java

/*
 * 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.MeasurementPath;
import org.apache.iotdb.db.queryengine.plan.analyze.Analysis;
import org.apache.iotdb.db.queryengine.plan.expression.Expression;
import org.apache.iotdb.db.queryengine.plan.expression.leaf.TimeSeriesOperand;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;

public class ReplaceSubTreeWithViewVisitor extends ReconstructVisitor<Analysis> {

  @Override
  public Expression process(Expression expression, Analysis analysis) {
    if (expression.isViewExpression()) {
      TSDataType dataType = analysis.getType(expression);
      return new TimeSeriesOperand(new MeasurementPath(expression.getViewPath(), dataType));
    }
    return expression.accept(this, analysis);
  }

  @Override
  public Expression visitTimeSeriesOperand(TimeSeriesOperand timeSeriesOperand, Analysis analysis) {
    return timeSeriesOperand;
  }
}