| /* |
| * 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. |
| */ |
| |
| /** |
| * Pig UDFs for Tuple sketches. |
| * Tuple sketches are based on the idea of Theta sketches with the addition of |
| * values associated with unique keys. |
| * Two sets of tuple sketch classes are available at the moment: |
| * generic Tuple sketches with user-defined Summary, and a faster specialized |
| * implementation with an array of double values. |
| * |
| * <p>There are two sets of Pig UDFs: one for generic Tuple sketch with an example |
| * implementation for DoubleSummay, and another one for a specialized ArrayOfDoublesSketch. |
| * |
| * <p> The generic implementation is in the form of abstract classes DataToSketch and |
| * UnionSketch to be specialized for particular types of Summary. |
| * An example implementation for DoubleSumamry is provided: DataToDoubleSummarySketch and |
| * UnionDoubleSummarySketch, as well as UDFs to obtain the results from sketches: |
| * DoubleSumamrySketchToEstimates and DoubleSummarySketchToPercentile. |
| * |
| * <p>UDFs for ArrayOfDoublesSketch: DataToArrayOfDoublesSketch, UnionArrayOfDoublesSketch, |
| * ArrayOfDoublesSketchToEstimates. |
| * |
| * @author Alexander Saydakov |
| */ |
| package org.apache.datasketches.pig.tuple; |