Repository navigation
Expand file tree
/
Copy pathVariableWidthOutOfPlaceVectorSorter.java
More file actions
93 lines (82 loc) · 4.23 KB
/
Copy pathVariableWidthOutOfPlaceVectorSorter.java
File metadata and controls
93 lines (82 loc) · 4.23 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
/*
* 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.arrow.algorithm.sort;
import org.apache.arrow.memory.ArrowBuf;
import org.apache.arrow.util.Preconditions;
import org.apache.arrow.vector.BaseVariableWidthVector;
import org.apache.arrow.vector.BitVectorHelper;
import org.apache.arrow.vector.IntVector;
import io.netty.util.internal.PlatformDependent;
/**
* Default sorter for variable-width vectors.
* It is an out-of-place sort, with time complexity O(n*log(n)).
* @param <V> vector type.
*/
public class VariableWidthOutOfPlaceVectorSorter<V extends BaseVariableWidthVector>
implements OutOfPlaceVectorSorter<V> {
protected IndexSorter<V> indexSorter = new IndexSorter<>();
@Override
public void sortOutOfPlace(V srcVector, V dstVector, VectorValueComparator<V> comparator) {
comparator.attachVector(srcVector);
// buffers referenced in the sort
ArrowBuf srcValueBuffer = srcVector.getDataBuffer();
ArrowBuf srcOffsetBuffer = srcVector.getOffsetBuffer();
ArrowBuf dstValidityBuffer = dstVector.getValidityBuffer();
ArrowBuf dstValueBuffer = dstVector.getDataBuffer();
ArrowBuf dstOffsetBuffer = dstVector.getOffsetBuffer();
// check buffer size
Preconditions.checkArgument(dstValidityBuffer.capacity() * 8 >= srcVector.getValueCount(),
"Not enough capacity for the validity buffer of the dst vector. " +
"Expected capacity %s, actual capacity %s",
(srcVector.getValueCount() + 7) / 8, dstValidityBuffer.capacity());
Preconditions.checkArgument(
dstOffsetBuffer.capacity() >= (srcVector.getValueCount() + 1) * BaseVariableWidthVector.OFFSET_WIDTH,
"Not enough capacity for the offset buffer of the dst vector. " +
"Expected capacity %s, actual capacity %s",
(srcVector.getValueCount() + 1) * BaseVariableWidthVector.OFFSET_WIDTH, dstOffsetBuffer.capacity());
long dataSize = srcVector.getOffsetBuffer().getInt(
srcVector.getValueCount() * BaseVariableWidthVector.OFFSET_WIDTH);
Preconditions.checkArgument(
dstValueBuffer.capacity() >= dataSize, "No enough capacity for the data buffer of the dst vector. " +
"Expected capacity %s, actual capacity %s", dataSize, dstValueBuffer.capacity());
// sort value indices
try (IntVector sortedIndices = new IntVector("", srcVector.getAllocator())) {
sortedIndices.allocateNew(srcVector.getValueCount());
sortedIndices.setValueCount(srcVector.getValueCount());
indexSorter.sort(srcVector, sortedIndices, comparator);
int dstOffset = 0;
dstOffsetBuffer.setInt(0, 0);
// copy sorted values to the output vector
for (int dstIndex = 0; dstIndex < sortedIndices.getValueCount(); dstIndex++) {
int srcIndex = sortedIndices.get(dstIndex);
if (srcVector.isNull(srcIndex)) {
BitVectorHelper.unsetBit(dstValidityBuffer, dstIndex);
} else {
BitVectorHelper.setBit(dstValidityBuffer, dstIndex);
int srcOffset = srcOffsetBuffer.getInt(srcIndex * BaseVariableWidthVector.OFFSET_WIDTH);
int valueLength = srcOffsetBuffer.getInt((srcIndex + 1) * BaseVariableWidthVector.OFFSET_WIDTH) - srcOffset;
PlatformDependent.copyMemory(
srcValueBuffer.memoryAddress() + srcOffset,
dstValueBuffer.memoryAddress() + dstOffset,
valueLength);
dstOffset += valueLength;
}
dstOffsetBuffer.setInt((dstIndex + 1) * BaseVariableWidthVector.OFFSET_WIDTH, dstOffset);
}
}
}
}