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.pig;
  
  import org.apache.calcite.sql.SqlKind;
  
  /**
   * Supported Pig aggregate functions and their Calcite counterparts. The enum's
   * name() is the same as the function's name in Pig Latin.
   */
  public enum PigAggFunction {
  
    COUNT(SqlKind.COUNT, false), COUNT_STAR(SqlKind.COUNT, true);
  
    private final SqlKind calciteFunc;
    private final boolean star; // as in COUNT(*)
  
    PigAggFunction(SqlKind calciteFunc) {
      this(calciteFunc, false);
    }
  
    PigAggFunction(SqlKind calciteFunc, boolean star) {
      this.calciteFunc = calciteFunc;
      this.star = star;
    }
  
    public static PigAggFunction valueOf(SqlKind calciteFunc, boolean star) {
      for (PigAggFunction pigAggFunction : values()) {
        if (pigAggFunction.calciteFunc == calciteFunc && pigAggFunction.star == star) {
          return pigAggFunction;
        }
      }
      throw new IllegalArgumentException("Pig agg func for " + calciteFunc + " is not supported");
    }
  }
  