| /* |
| * 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.commons.udf.builtin; |
| |
| import org.apache.iotdb.tsfile.read.common.block.column.Column; |
| import org.apache.iotdb.tsfile.read.common.block.column.ColumnBuilder; |
| import org.apache.iotdb.udf.api.UDTF; |
| import org.apache.iotdb.udf.api.access.Row; |
| import org.apache.iotdb.udf.api.collector.PointCollector; |
| import org.apache.iotdb.udf.api.customizer.config.UDTFConfigurations; |
| import org.apache.iotdb.udf.api.customizer.parameter.UDFParameters; |
| import org.apache.iotdb.udf.api.customizer.strategy.MappableRowByRowAccessStrategy; |
| import org.apache.iotdb.udf.api.type.Type; |
| |
| import java.io.IOException; |
| |
| public class UDTFConstE implements UDTF { |
| |
| @Override |
| public void beforeStart(UDFParameters parameters, UDTFConfigurations configurations) { |
| configurations |
| .setAccessStrategy(new MappableRowByRowAccessStrategy()) |
| .setOutputDataType(Type.DOUBLE); |
| } |
| |
| @Override |
| public void transform(Row row, PointCollector collector) throws Exception { |
| collector.putDouble(row.getTime(), Math.E); |
| } |
| |
| @Override |
| public Object transform(Row row) throws IOException { |
| return Math.E; |
| } |
| |
| @Override |
| public void transform(Column[] columns, ColumnBuilder builder) throws Exception { |
| int rowCount = columns[0].getPositionCount(); |
| |
| for (int i = 0; i < rowCount; i++) { |
| boolean hasWritten = false; |
| for (int j = 0; j < columns.length - 1; j++) { |
| if (!columns[j].isNull(i)) { |
| builder.writeDouble(Math.E); |
| hasWritten = true; |
| break; |
| } |
| } |
| if (!hasWritten) { |
| builder.appendNull(); |
| } |
| } |
| } |
| } |