| /* |
| * 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.fun; |
| |
| import org.apache.calcite.rel.type.RelDataType; |
| import org.apache.calcite.sql.SqlAggFunction; |
| import org.apache.calcite.sql.SqlFunctionCategory; |
| import org.apache.calcite.sql.SqlKind; |
| import org.apache.calcite.sql.type.OperandTypes; |
| import org.apache.calcite.sql.type.ReturnTypes; |
| import org.apache.calcite.util.Optionality; |
| |
| import static com.google.common.base.Preconditions.checkArgument; |
| |
| /** |
| * <code>Avg</code> is an aggregator which returns the average of the values |
| * which go into it. It has precisely one argument of numeric type |
| * (<code>int</code>, <code>long</code>, <code>float</code>, <code> |
| * double</code>), and the result is the same type. |
| */ |
| public class SqlAvgAggFunction extends SqlAggFunction { |
| |
| //~ Constructors ----------------------------------------------------------- |
| |
| /** |
| * Creates a SqlAvgAggFunction. |
| */ |
| public SqlAvgAggFunction(SqlKind kind) { |
| this(kind.name(), kind); |
| } |
| |
| SqlAvgAggFunction(String name, SqlKind kind) { |
| super(name, |
| null, |
| kind, |
| ReturnTypes.AVG_AGG_FUNCTION, |
| null, |
| OperandTypes.NUMERIC, |
| SqlFunctionCategory.NUMERIC, |
| false, |
| false, |
| Optionality.FORBIDDEN); |
| checkArgument(SqlKind.AVG_AGG_FUNCTIONS.contains(kind), |
| "unsupported sql kind"); |
| } |
| |
| @Deprecated // to be removed before 2.0 |
| public SqlAvgAggFunction( |
| RelDataType type, |
| Subtype subtype) { |
| this(SqlKind.valueOf(subtype.name())); |
| } |
| |
| //~ Methods ---------------------------------------------------------------- |
| |
| /** |
| * Returns the specific function, e.g. AVG or STDDEV_POP. |
| * |
| * @return Subtype |
| */ |
| @Deprecated // to be removed before 2.0 |
| public Subtype getSubtype() { |
| return Subtype.valueOf(kind.name()); |
| } |
| |
| /** Sub-type of aggregate function. */ |
| @Deprecated // to be removed before 2.0 |
| public enum Subtype { |
| AVG, |
| STDDEV_POP, |
| STDDEV_SAMP, |
| VAR_POP, |
| VAR_SAMP |
| } |
| } |