| /* |
| // Licensed to Julian Hyde under one or more contributor license |
| // agreements. See the NOTICE file distributed with this work for |
| // additional information regarding copyright ownership. |
| // |
| // Julian Hyde 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 net.hydromatic.optiq; |
| |
| import org.eigenbase.reltype.RelDataType; |
| import org.eigenbase.reltype.RelDataTypeFactory; |
| |
| /** |
| * Function that combines several values into a scalar result. |
| */ |
| public interface AggregateFunction extends Function { |
| /** |
| * Returns the return type of this function, constructed using the given |
| * type factory. |
| * |
| * @param typeFactory Type factory |
| */ |
| RelDataType getReturnType(RelDataTypeFactory typeFactory); |
| } |
| |
| // End AggregateFunction.java |
