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.sql.validate;
  
  import org.apache.calcite.rel.type.RelDataTypeFactory;
  import org.apache.calcite.schema.AggregateFunction;
  import org.apache.calcite.sql.SqlAggFunction;
  import org.apache.calcite.sql.SqlFunctionCategory;
  import org.apache.calcite.sql.SqlIdentifier;
  import org.apache.calcite.sql.SqlKind;
  import org.apache.calcite.sql.type.SqlOperandMetadata;
  import org.apache.calcite.sql.type.SqlOperandTypeChecker;
  import org.apache.calcite.sql.type.SqlOperandTypeInference;
  import org.apache.calcite.sql.type.SqlReturnTypeInference;
  import org.apache.calcite.util.Optionality;
  import org.apache.calcite.util.Util;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /**
   * User-defined aggregate function.
   *
   * <p>Created by the validator, after resolving a function call to a function
   * defined in a Calcite schema.
   */
  public class SqlUserDefinedAggFunction extends SqlAggFunction {
    public final AggregateFunction function;
  
    @Deprecated // to be removed before 2.0
    public SqlUserDefinedAggFunction(SqlIdentifier opName,
        SqlReturnTypeInference returnTypeInference,
        SqlOperandTypeInference operandTypeInference,
        @Nullable SqlOperandTypeChecker operandTypeChecker, AggregateFunction function,
        boolean requiresOrder, boolean requiresOver,
        Optionality requiresGroupOrder, RelDataTypeFactory typeFactory) {
      this(opName, SqlKind.OTHER_FUNCTION, returnTypeInference,
          operandTypeInference,
          operandTypeChecker instanceof SqlOperandMetadata
              ? (SqlOperandMetadata) operandTypeChecker : null, function,
          requiresOrder, requiresOver, requiresGroupOrder);
      Util.discard(typeFactory); // no longer used
    }
  
    /** Creates a SqlUserDefinedAggFunction. */
    public SqlUserDefinedAggFunction(SqlIdentifier opName, SqlKind kind,
        SqlReturnTypeInference returnTypeInference,
        SqlOperandTypeInference operandTypeInference,
        @Nullable SqlOperandMetadata operandMetadata, AggregateFunction function,
        boolean requiresOrder, boolean requiresOver,
        Optionality requiresGroupOrder) {
      super(Util.last(opName.names), opName, kind,
          returnTypeInference, operandTypeInference, operandMetadata,
          SqlFunctionCategory.USER_DEFINED_FUNCTION, requiresOrder, requiresOver,
          requiresGroupOrder);
      this.function = function;
    }
  
    @Override public @Nullable SqlOperandMetadata getOperandTypeChecker() {
      return (@Nullable SqlOperandMetadata) super.getOperandTypeChecker();
    }
  }
  