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.auron.functions;
  
  /**
   * Wrapper context for user-defined functions (UDFs).
   * This class bridges different engines and native UDF implementations.
   * SQL engines such as Spark and Flink should provide their respective implementations based on this.
   */
  public interface AuronUDFWrapperContext {
  
      /**
       * Opens the UDF context with the given resource ID.
       * The Flink engine requires the FunctionContext, which can be obtained via the ResourceID, to initialize the Flink ScalarFunction.
       * @param resourceId
       */
      default void open(String resourceId) {}
  
      /**
       * Evaluates the UDF with the provided input and output pointers.
       * This method is called for each invocation of the UDF during query execution.
       *
       * @param inputPtr Native pointer to the input data
       * @param outputPtr Native pointer to the output location where results should be written
       */
      void eval(long inputPtr, long outputPtr);
  
      /**
       * Closes the UDF context.
       * Some UDFs may need to perform resource cleanup operations.
       */
      default void close() {}
  }
  