content: /*
   * 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.calcite.rel.type;
  
  /**
   * Specific type of RelRecordType that corresponds to a dynamic table,
   * where columns are created as they are requested.
   */
  public abstract class DynamicRecordType extends RelDataTypeImpl {
  
    // The prefix string for dynamic star column name
    public static final String DYNAMIC_STAR_PREFIX = "**";
  
    @Override public boolean isDynamicStruct() {
      return true;
    }
  
    /**
     * Returns true if the column name starts with DYNAMIC_STAR_PREFIX.
     */
    public static boolean isDynamicStarColName(String name) {
      return name.startsWith(DYNAMIC_STAR_PREFIX);
    }
  
  }
  