云服务器内容精选

  • 代码样例 package com.huawei.bigdata.iotdb; 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.RowByRowAccessStrategy; import org.apache.iotdb.udf.api.type.Type; import java.io.IOException; public class UDTFExample implements UDTF { @Override public void beforeStart(UDFParameters parameters, UDTFConfigurations configurations) { configurations.setAccessStrategy(new RowByRowAccessStrategy()).setOutputDataType(Type.INT32); } @Override public void transform(Row row, PointCollector collector) throws IOException { collector.putInt(row.getTime(), -row.getInt(0)); } }