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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
// 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 encoding
import (
"encoding/binary"
"github.com/apache/arrow-go/v18/arrow/bitutil"
"github.com/apache/arrow-go/v18/parquet"
"github.com/apache/arrow-go/v18/parquet/internal/debug"
"github.com/apache/arrow-go/v18/parquet/internal/utils"
)
const (
boolBufSize = 1024
boolsInBuf = boolBufSize * 8
)
// PlainBooleanEncoder encodes bools as a bitmap as per the Plain Encoding
type PlainBooleanEncoder struct {
encoder
bitsBuffer []byte
wr utils.BitmapWriter
}
// Type for the PlainBooleanEncoder is parquet.Types.Boolean
func (PlainBooleanEncoder) Type() parquet.Type {
return parquet.Types.Boolean
}
// Put encodes the contents of in into the underlying data buffer.
func (enc *PlainBooleanEncoder) Put(in []bool) {
if enc.bitsBuffer == nil {
enc.bitsBuffer = make([]byte, boolBufSize)
}
if enc.wr == nil {
enc.wr = utils.NewBitmapWriter(enc.bitsBuffer, 0, boolsInBuf)
}
if len(in) == 0 {
return
}
n := enc.wr.AppendBools(in)
for n < len(in) {
enc.wr.Finish()
enc.append(enc.bitsBuffer)
enc.wr.Reset(0, boolsInBuf)
in = in[n:]
n = enc.wr.AppendBools(in)
}
}
// PutSpaced will use the validBits bitmap to determine which values are nulls
// and can be left out from the slice, and the encoded without those nulls.
func (enc *PlainBooleanEncoder) PutSpaced(in []bool, validBits []byte, validBitsOffset int64) {
bufferOut := make([]bool, len(in))
nvalid := spacedCompress(in, bufferOut, validBits, validBitsOffset)
enc.Put(bufferOut[:nvalid])
}
// EstimatedDataEncodedSize returns the current number of bytes that have
// been buffered so far
func (enc *PlainBooleanEncoder) EstimatedDataEncodedSize() int64 {
return int64(enc.sink.Len() + int(bitutil.BytesForBits(int64(enc.wr.Pos()))))
}
// FlushValues returns the buffered data, the responsibility is on the caller
// to release the buffer memory
func (enc *PlainBooleanEncoder) FlushValues() (Buffer, error) {
if enc.wr.Pos() > 0 {
toFlush := int(enc.wr.Pos())
enc.append(enc.bitsBuffer[:bitutil.BytesForBits(int64(toFlush))])
}
enc.wr.Reset(0, boolsInBuf)
return enc.sink.Finish(), nil
}
const rleLengthInBytes = 4
type RleBooleanEncoder struct {
encoder
bufferedValues []bool
}
func (RleBooleanEncoder) Type() parquet.Type {
return parquet.Types.Boolean
}
func (enc *RleBooleanEncoder) Put(in []bool) {
enc.bufferedValues = append(enc.bufferedValues, in...)
}
func (enc *RleBooleanEncoder) PutSpaced(in []bool, validBits []byte, validBitsOffset int64) {
bufferOut := make([]bool, len(in))
nvalid := spacedCompress(in, bufferOut, validBits, validBitsOffset)
enc.Put(bufferOut[:nvalid])
}
func (enc *RleBooleanEncoder) EstimatedDataEncodedSize() int64 {
return rleLengthInBytes + int64(enc.maxRleBufferSize())
}
func (enc *RleBooleanEncoder) maxRleBufferSize() int {
return utils.MaxRLEBufferSize(1, len(enc.bufferedValues)) +
utils.MinRLEBufferSize(1)
}
func (enc *RleBooleanEncoder) FlushValues() (Buffer, error) {
rleBufferSizeMax := enc.maxRleBufferSize()
enc.sink.SetOffset(rleLengthInBytes)
enc.sink.Reserve(rleBufferSizeMax)
rleEncoder := utils.NewRleEncoder(enc.sink, 1)
for _, v := range enc.bufferedValues {
if v {
rleEncoder.Put(1)
} else {
rleEncoder.Put(0)
}
}
n := rleEncoder.Flush()
debug.Assert(n <= rleBufferSizeMax, "num encoded bytes larger than expected max")
buf := enc.sink.Finish()
binary.LittleEndian.PutUint32(buf.Bytes(), uint32(n))
return buf, nil
}
|
