forked from ClickHouse/clickhouse-go
/
array.go
149 lines (138 loc) · 3.31 KB
/
array.go
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
145
146
147
148
149
package column
import (
"bytes"
"fmt"
"reflect"
"time"
"github.com/kshvakov/clickhouse/lib/binary"
)
type ArrayWriter interface {
WriteArray(encoder *binary.Encoder, column Column) (uint64, error)
}
type Array struct {
base
column Column
}
func (array *Array) Read(decoder *binary.Decoder) (interface{}, error) {
return nil, fmt.Errorf("do not use Read method for Array(T) column")
}
func (array *Array) Write(encoder *binary.Encoder, v interface{}) error {
return fmt.Errorf("do not use Write method for Array(T) column")
}
func (array *Array) ReadArray(decoder *binary.Decoder, rows int) (_ []interface{}, err error) {
var (
values = make([]interface{}, rows)
offsets = make([]uint64, rows)
)
for i := 0; i < rows; i++ {
offset, err := decoder.UInt64()
if err != nil {
return nil, err
}
offsets[i] = offset
}
for n, offset := range offsets {
ln := offset
if n != 0 {
ln = ln - offsets[n-1]
}
if values[n], err = array.read(decoder, int(ln)); err != nil {
return nil, err
}
}
return values, nil
}
func (array *Array) read(decoder *binary.Decoder, ln int) (interface{}, error) {
slice := reflect.MakeSlice(array.valueOf.Type(), 0, ln)
for i := 0; i < ln; i++ {
value, err := array.column.Read(decoder)
if err != nil {
return nil, err
}
slice = reflect.Append(slice, reflect.ValueOf(value))
}
return slice.Interface(), nil
}
func (array *Array) WriteArray(encoder *binary.Encoder, v interface{}) (uint64, error) {
switch value := v.(type) {
case ArrayWriter:
return value.WriteArray(encoder, array.column)
case []byte:
var (
buff = bytes.NewBuffer(value)
decoder = binary.NewDecoder(buff)
)
ln, err := decoder.Uvarint()
if err != nil {
return 0, err
}
switch array.column.(type) {
case *Enum:
slice := make([]string, 0, ln)
for i := 0; i < int(ln); i++ {
v, err := decoder.String()
if err != nil {
return 0, err
}
slice = append(slice, v)
}
for _, v := range slice {
if err := array.column.Write(encoder, v); err != nil {
return 0, err
}
}
default:
if _, err := buff.WriteTo(encoder); err != nil {
return 0, err
}
}
return ln, nil
}
return 0, nil
}
func parseArray(name, chType string, timezone *time.Location) (*Array, error) {
if len(chType) < 11 {
return nil, fmt.Errorf("invalid Array column type: %s", chType)
}
column, err := Factory(name, chType[6:][:len(chType)-7], timezone)
if err != nil {
return nil, fmt.Errorf("Array(T): %v", err)
}
var scanType interface{}
switch t := column.ScanType().Kind(); t {
case reflect.Int8:
scanType = []int8{}
case reflect.Int16:
scanType = []int16{}
case reflect.Int32:
scanType = []int32{}
case reflect.Int64:
scanType = []int64{}
case reflect.Uint8:
scanType = []uint8{}
case reflect.Uint16:
scanType = []uint16{}
case reflect.Uint32:
scanType = []uint32{}
case reflect.Uint64:
scanType = []uint64{}
case reflect.Float32:
scanType = []float32{}
case reflect.Float64:
scanType = []float64{}
case reflect.String:
scanType = []string{}
case baseTypes[time.Time{}].Kind():
scanType = []time.Time{}
default:
return nil, fmt.Errorf("unsupported Array type '%s'", column.ScanType().Name())
}
return &Array{
base: base{
name: name,
chType: chType,
valueOf: reflect.ValueOf(scanType),
},
column: column,
}, nil
}