| /* |
| * Copyright 2016, 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 java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| |
| import org.apache.hadoop.hive.ql.exec.UDFArgumentException; |
| import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException; |
| import org.apache.hadoop.hive.ql.metadata.HiveException; |
| import org.apache.hadoop.hive.ql.udf.generic.GenericUDTF; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorFactory; |
| import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector; |
| import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory; |
| import org.apache.hadoop.io.BytesWritable; |
| |
| import com.yahoo.memory.Memory; |
| import com.yahoo.sketches.tuple.ArrayOfDoublesSketch; |
| import com.yahoo.sketches.tuple.ArrayOfDoublesSketchIterator; |
| import com.yahoo.sketches.tuple.ArrayOfDoublesSketches; |
| |
| @SuppressWarnings("javadoc") |
| public class ArrayOfDoublesSketchToValuesUDTF extends GenericUDTF { |
| |
| PrimitiveObjectInspector inputObjectInspector; |
| |
| @Override |
| public StructObjectInspector initialize(final ObjectInspector[] inspectors) throws UDFArgumentException { |
| if (inspectors.length != 1) { |
| throw new UDFArgumentException("One argument expected"); |
| } |
| if (inspectors[0].getCategory() != ObjectInspector.Category.PRIMITIVE) { |
| throw new UDFArgumentTypeException(0, "Primitive argument expected, but " |
| + inspectors[0].getCategory().name() + " was recieved"); |
| } |
| inputObjectInspector = (PrimitiveObjectInspector) inspectors[0]; |
| if (inputObjectInspector.getPrimitiveCategory() != PrimitiveObjectInspector.PrimitiveCategory.BINARY) { |
| throw new UDFArgumentTypeException(0, "Binary value expected as the first argument, but " |
| + inputObjectInspector.getPrimitiveCategory().name() + " was recieved"); |
| } |
| |
| return ObjectInspectorFactory.getStandardStructObjectInspector( |
| Arrays.asList("values"), |
| Arrays.asList( |
| ObjectInspectorFactory.getStandardListObjectInspector( |
| PrimitiveObjectInspectorFactory.javaDoubleObjectInspector |
| ) |
| ) |
| ); |
| } |
| |
| @Override |
| public void process(final Object[] data) throws HiveException { |
| if ((data == null) || (data[0] == null)) { return; } |
| final BytesWritable serializedSketch = |
| (BytesWritable) inputObjectInspector.getPrimitiveWritableObject(data[0]); |
| final ArrayOfDoublesSketch sketch = ArrayOfDoublesSketches.wrapSketch( |
| Memory.wrap(serializedSketch.getBytes())); |
| final ArrayOfDoublesSketchIterator it = sketch.iterator(); |
| while (it.next()) { |
| forward(new Object[] { primitivesToList(it.getValues()) }); |
| } |
| } |
| |
| @Override |
| public void close() throws HiveException { |
| } |
| |
| static List<Double> primitivesToList(final double[] array) { |
| final List<Double> result = new ArrayList<>(array.length); |
| for (double item: array) { result.add(item); } |
| return result; |
| } |
| |
| } |