| /* |
| * Copyright 2017, Yahoo! Inc. |
| * Licensed under the terms of the Apache License 2.0. See LICENSE file at the project root for terms. |
| */ |
| |
| package com.yahoo.sketches.hive.tuple; |
| |
| import org.apache.hadoop.hive.ql.exec.Description; |
| import org.apache.hadoop.hive.ql.exec.UDF; |
| import org.apache.hadoop.io.BytesWritable; |
| |
| import com.yahoo.memory.Memory; |
| import com.yahoo.sketches.tuple.ArrayOfDoublesSketch; |
| import com.yahoo.sketches.tuple.ArrayOfDoublesSketches; |
| |
| @Description( |
| name = "ArrayOfDoublesSketchToNumberOfRetainedEntries", |
| value = "_FUNC_(sketch)", |
| extended = "Returns the number of retained entries from a given ArrayOfDoublesSketch." |
| + " The result is an integer value.") |
| public class ArrayOfDoublesSketchToNumberOfRetainedEntriesUDF extends UDF { |
| |
| /** |
| * Get number of retained entries from a given ArrayOfDoublesSketch |
| * @param serializedSketch ArrayOfDoublesSketch in as serialized binary |
| * @return number of retained entries |
| */ |
| public Integer evaluate(final BytesWritable serializedSketch) { |
| if (serializedSketch == null) { return null; } |
| final ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.wrapSketch( |
| Memory.wrap(serializedSketch.getBytes())); |
| return sketch.getRetainedEntries(); |
| } |
| |
| } |