| /* |
| * 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.commons.udf.utils.UDFDataTypeTransformer; |
| import org.apache.iotdb.udf.api.exception.UDFInputSeriesDataTypeNotValidException; |
| import org.apache.iotdb.udf.api.type.Type; |
| |
| import org.apache.tsfile.utils.Pair; |
| |
| import java.util.Comparator; |
| import java.util.Objects; |
| import java.util.PriorityQueue; |
| |
| public class UDTFBottomK extends UDTFSelectK { |
| |
| @Override |
| protected void constructPQ() throws UDFInputSeriesDataTypeNotValidException { |
| switch (dataType) { |
| case INT32: |
| intPQ = new PriorityQueue<>(k, Comparator.comparing(o -> -o.right)); |
| break; |
| case INT64: |
| longPQ = new PriorityQueue<>(k, Comparator.comparing(o -> -o.right)); |
| break; |
| case FLOAT: |
| floatPQ = new PriorityQueue<>(k, Comparator.comparing(o -> -o.right)); |
| break; |
| case DOUBLE: |
| doublePQ = new PriorityQueue<>(k, Comparator.comparing(o -> -o.right)); |
| break; |
| case TEXT: |
| stringPQ = |
| new PriorityQueue<>( |
| k, |
| (pairA, pairB) -> { |
| final String cs1 = pairB.right; |
| final String cs2 = pairA.right; |
| |
| if (Objects.requireNonNull(cs1).equals(Objects.requireNonNull(cs2))) { |
| return 0; |
| } |
| |
| for (int i = 0, len = Math.min(cs1.length(), cs2.length()); i < len; i++) { |
| final char a = cs1.charAt(i); |
| final char b = cs2.charAt(i); |
| if (a != b) { |
| return a - b; |
| } |
| } |
| |
| return cs1.length() - cs2.length(); |
| }); |
| break; |
| default: |
| // This will not happen. |
| throw new UDFInputSeriesDataTypeNotValidException( |
| 0, |
| UDFDataTypeTransformer.transformToUDFDataType(dataType), |
| Type.INT32, |
| Type.INT64, |
| Type.FLOAT, |
| Type.DOUBLE, |
| Type.TEXT); |
| } |
| } |
| |
| @Override |
| protected void transformInt(long time, int value) { |
| if (intPQ.size() < k) { |
| intPQ.add(new Pair<>(time, value)); |
| } else if (value < intPQ.peek().right) { |
| intPQ.poll(); |
| intPQ.add(new Pair<>(time, value)); |
| } |
| } |
| |
| @Override |
| protected void transformLong(long time, long value) { |
| if (longPQ.size() < k) { |
| longPQ.add(new Pair<>(time, value)); |
| } else if (value < longPQ.peek().right) { |
| longPQ.poll(); |
| longPQ.add(new Pair<>(time, value)); |
| } |
| } |
| |
| @Override |
| protected void transformFloat(long time, float value) { |
| if (floatPQ.size() < k) { |
| floatPQ.add(new Pair<>(time, value)); |
| } else if (value < floatPQ.peek().right) { |
| floatPQ.poll(); |
| floatPQ.add(new Pair<>(time, value)); |
| } |
| } |
| |
| @Override |
| protected void transformDouble(long time, double value) { |
| if (doublePQ.size() < k) { |
| doublePQ.add(new Pair<>(time, value)); |
| } else if (value < doublePQ.peek().right) { |
| doublePQ.poll(); |
| doublePQ.add(new Pair<>(time, value)); |
| } |
| } |
| |
| @Override |
| protected void transformString(long time, String value) { |
| if (stringPQ.size() < k) { |
| stringPQ.add(new Pair<>(time, value)); |
| } else if (value.compareTo(stringPQ.peek().right) < 0) { |
| stringPQ.poll(); |
| stringPQ.add(new Pair<>(time, value)); |
| } |
| } |
| } |