iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/plan/expression/leaf/LeafOperand.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.leaf;

import org.apache.iotdb.db.queryengine.common.NodeRef;
import org.apache.iotdb.db.queryengine.plan.expression.Expression;
import org.apache.iotdb.db.queryengine.transformation.dag.udf.UDTFExecutor;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;

import java.time.ZoneId;
import java.util.Collections;
import java.util.List;
import java.util.Map;

public abstract class LeafOperand extends Expression {

  @Override
  public final List<Expression> getExpressions() {
    return Collections.emptyList();
  }

  @Override
  public final void constructUdfExecutors(
      Map<String, UDTFExecutor> expressionName2Executor, ZoneId zoneId) {
    // nothing to do
  }

  @Override
  public boolean isMappable(Map<NodeRef<Expression>, TSDataType> expressionTypes) {
    return true;
  }

  @Override
  public String getOutputSymbolInternal() {
    return this.getExpressionString();
  }
}