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.RexNode;
  
  import java.util.List;
  
  /**
   * Information for a call to
   * {@link AggImplementor#implementResult(AggContext, AggResultContext)}.
   *
   * <p>Typically, the aggregation implementation will convert
   * {@link #accumulator()} to the resulting value of the aggregation.  The
   * implementation MUST NOT destroy the contents of {@link #accumulator()}.
   */
  public interface WinAggResultContext extends AggResultContext,
      WinAggFrameResultContext {
    /**
     * Returns {@link org.apache.calcite.rex.RexNode} representation of arguments.
     * This can be useful for manual translation of required arguments with
     * different {@link NullPolicy}.
     *
     * @return {@link org.apache.calcite.rex.RexNode} representation of arguments
     */
    List<RexNode> rexArguments();
  
    /**
     * Returns Linq4j form of arguments.
     * The resulting value is equivalent to
     * {@code rowTranslator().translateList(rexArguments())}.
     * This is handy if you need just operate on argument.
     *
     * @param rowIndex index of the requested row. The index must be in range
     *                 of partition's startIndex and endIndex.
     * @return Linq4j form of arguments of the particular row
     */
    List<Expression> arguments(Expression rowIndex);
  }
  