| /* |
| * 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.query.udf.example; |
| |
| import org.apache.iotdb.tsfile.exception.write.UnSupportedDataTypeException; |
| import org.apache.iotdb.tsfile.read.common.block.column.Column; |
| import org.apache.iotdb.tsfile.utils.BitMap; |
| import org.apache.iotdb.udf.api.State; |
| import org.apache.iotdb.udf.api.UDAF; |
| import org.apache.iotdb.udf.api.customizer.config.UDAFConfigurations; |
| import org.apache.iotdb.udf.api.customizer.parameter.UDFParameterValidator; |
| import org.apache.iotdb.udf.api.customizer.parameter.UDFParameters; |
| import org.apache.iotdb.udf.api.exception.UDFException; |
| import org.apache.iotdb.udf.api.type.Type; |
| import org.apache.iotdb.udf.api.utils.ResultValue; |
| |
| import java.nio.ByteBuffer; |
| |
| public class UDAFAvg implements UDAF { |
| static class AvgState implements State { |
| double sum; |
| |
| long count; |
| |
| @Override |
| public void reset() { |
| sum = 0; |
| count = 0; |
| } |
| |
| @Override |
| public byte[] serialize() { |
| ByteBuffer buffer = ByteBuffer.allocate(Double.BYTES + Long.BYTES); |
| buffer.putDouble(sum); |
| buffer.putLong(count); |
| |
| return buffer.array(); |
| } |
| |
| @Override |
| public void deserialize(byte[] bytes) { |
| ByteBuffer buffer = ByteBuffer.wrap(bytes); |
| sum = buffer.getDouble(); |
| count = buffer.getLong(); |
| } |
| } |
| |
| private Type dataType; |
| |
| @Override |
| public void validate(UDFParameterValidator validator) throws UDFException { |
| validator |
| .validateInputSeriesNumber(1) |
| .validateInputSeriesDataType(0, Type.INT32, Type.INT64, Type.FLOAT, Type.DOUBLE); |
| } |
| |
| @Override |
| public void beforeStart(UDFParameters parameters, UDAFConfigurations configurations) { |
| dataType = parameters.getDataType(0); |
| configurations.setOutputDataType(Type.DOUBLE); |
| } |
| |
| @Override |
| public State createState() { |
| return new AvgState(); |
| } |
| |
| @Override |
| public void addInput(State state, Column[] columns, BitMap bitMap) { |
| AvgState avgState = (AvgState) state; |
| |
| switch (dataType) { |
| case INT32: |
| addIntInput(avgState, columns, bitMap); |
| return; |
| case INT64: |
| addLongInput(avgState, columns, bitMap); |
| return; |
| case FLOAT: |
| addFloatInput(avgState, columns, bitMap); |
| return; |
| case DOUBLE: |
| addDoubleInput(avgState, columns, bitMap); |
| return; |
| case TEXT: |
| case BOOLEAN: |
| default: |
| throw new UnSupportedDataTypeException( |
| String.format("Unsupported data type in aggregation AVG : %s", dataType)); |
| } |
| } |
| |
| @Override |
| public void combineState(State state, State rhs) { |
| AvgState avgState = (AvgState) state; |
| AvgState avgRhs = (AvgState) rhs; |
| |
| avgState.count += avgRhs.count; |
| avgState.sum += avgRhs.sum; |
| } |
| |
| @Override |
| public void outputFinal(State state, ResultValue resultValue) { |
| AvgState avgState = (AvgState) state; |
| |
| if (avgState.count != 0) { |
| resultValue.setDouble(avgState.sum / avgState.count); |
| } else { |
| resultValue.setNull(); |
| } |
| } |
| |
| @Override |
| public void removeState(State state, State removed) { |
| AvgState avgState = (AvgState) state; |
| AvgState avgRhs = (AvgState) removed; |
| |
| avgState.count -= avgRhs.count; |
| avgState.sum -= avgRhs.sum; |
| } |
| |
| private void addIntInput(AvgState state, Column[] columns, BitMap bitMap) { |
| int count = columns[0].getPositionCount(); |
| for (int i = 0; i < count; i++) { |
| if (bitMap != null && !bitMap.isMarked(i)) { |
| continue; |
| } |
| if (!columns[0].isNull(i)) { |
| state.count++; |
| state.sum += columns[0].getInt(i); |
| } |
| } |
| } |
| |
| private void addLongInput(AvgState avgState, Column[] columns, BitMap bitMap) { |
| int count = columns[0].getPositionCount(); |
| for (int i = 0; i < count; i++) { |
| if (bitMap != null && !bitMap.isMarked(i)) { |
| continue; |
| } |
| if (!columns[0].isNull(i)) { |
| avgState.count++; |
| avgState.sum += columns[0].getLong(i); |
| } |
| } |
| } |
| |
| private void addFloatInput(AvgState avgState, Column[] columns, BitMap bitMap) { |
| int count = columns[0].getPositionCount(); |
| for (int i = 0; i < count; i++) { |
| if (bitMap != null && !bitMap.isMarked(i)) { |
| continue; |
| } |
| if (!columns[0].isNull(i)) { |
| avgState.count++; |
| avgState.sum += columns[0].getFloat(i); |
| } |
| } |
| } |
| |
| private void addDoubleInput(AvgState avgState, Column[] columns, BitMap bitMap) { |
| int count = columns[0].getPositionCount(); |
| for (int i = 0; i < count; i++) { |
| if (bitMap != null && !bitMap.isMarked(i)) { |
| continue; |
| } |
| if (!columns[0].isNull(i)) { |
| avgState.count++; |
| avgState.sum += columns[0].getDouble(i); |
| } |
| } |
| } |
| } |