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.adapter.enumerable;
  
  import org.apache.calcite.linq4j.tree.Expression;
  import org.apache.calcite.rex.RexCall;
  
  /**
   * Implements a call via given translator.
   *
   * @see org.apache.calcite.schema.ScalarFunction
   * @see org.apache.calcite.schema.TableFunction
   * @see org.apache.calcite.adapter.enumerable.RexImpTable
   */
  public interface CallImplementor {
    /**
     * Implements a call.
     *
     * @param translator Translator for the call
     * @param call Call that should be implemented
     * @param nullAs The desired mode of {@code null} translation
     * @return Translated call
     */
    Expression implement(
        RexToLixTranslator translator,
        RexCall call,
        RexImpTable.NullAs nullAs);
  }
  