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.asterix.external.writer.printer.parquet;
  
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IValueReference;
  
  public interface ISchemaChecker {
  
      // EQUIVALENT: Example: { name: string, age: int } -> { name: string, age: int }
      // GROWING: equivalent types but having extra fields, Example: { name: string, age: int } -> { name: string, age: int , address: string }
      // CONFLICTING: conflict in types, Example: { name: string, age: int } -> { name: {first:string, last:string}, age: int }
      enum SchemaComparisonType {
          EQUIVALENT,
          GROWING,
          CONFLICTING
      }
  
      static SchemaComparisonType max(ISchemaChecker.SchemaComparisonType a, ISchemaChecker.SchemaComparisonType b) {
          return a.compareTo(b) > 0 ? a : b;
      }
  
      SchemaComparisonType checkSchema(ParquetSchemaTree.SchemaNode schemaNode, IValueReference iValueReference)
              throws HyracksDataException;
  }
  