| /* |
| * 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.iotdb.db.queryengine.transformation.dag.input; |
| |
| import org.apache.iotdb.db.queryengine.transformation.api.YieldableState; |
| import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType; |
| |
| import java.io.IOException; |
| import java.util.List; |
| |
| /** The input data set interface for a UDFPlan. */ |
| public interface IUDFInputDataSet { |
| |
| /** returns the input data types, except the timestamp column(the last column). */ |
| List<TSDataType> getDataTypes(); |
| |
| /** Whether the data set has next row. */ |
| boolean hasNextRowInObjects() throws IOException; |
| |
| /** Whether the data set has next row. */ |
| default YieldableState canYieldNextRowInObjects() throws Exception { |
| return hasNextRowInObjects() |
| ? YieldableState.YIELDABLE |
| : YieldableState.NOT_YIELDABLE_NO_MORE_DATA; |
| } |
| |
| /** |
| * Get the next row for UDFPlan input. |
| * |
| * <p>The last element in the row is the timestamp. |
| */ |
| Object[] nextRowInObjects(); |
| } |