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/*
 * 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.druid.sql.calcite.expression;

import org.apache.calcite.rel.core.AggregateCall;
import org.apache.calcite.sql.SqlAggFunction;
import org.apache.druid.java.util.common.UOE;
import org.apache.druid.sql.calcite.aggregation.Aggregation;
import org.apache.druid.sql.calcite.aggregation.SqlAggregator;
import org.apache.druid.sql.calcite.planner.PlannerContext;
import org.apache.druid.sql.calcite.rel.InputAccessor;
import org.apache.druid.sql.calcite.rel.VirtualColumnRegistry;

import javax.annotation.Nullable;
import java.util.List;

/**
 * Conversion for SQL operators that map 1-1 onto native functions.
 */
public class WindowSqlAggregate implements SqlAggregator
{
  private final SqlAggFunction operator;

  public WindowSqlAggregate(final SqlAggFunction operator)
  {
    this.operator = operator;
  }

  @Override
  public SqlAggFunction calciteFunction()
  {
    return operator;
  }

  @Nullable
  @Override
  public Aggregation toDruidAggregation(
      PlannerContext plannerContext,
      VirtualColumnRegistry virtualColumnRegistry,
      String name,
      AggregateCall aggregateCall,
      InputAccessor inputAccessor,
      List existingAggregations,
      boolean finalizeAggregations
  )
  {
    throw new UOE("%s can only be used in a window function, this method shouldn't be called...", operator.getName());
  }
}