This repository has been archived by the owner on Jul 8, 2020. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 2
/
smartbuilder.go
174 lines (164 loc) · 4.08 KB
/
smartbuilder.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
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
package dataframe
import (
"fmt"
"os"
"github.com/apache/arrow/go/arrow"
"github.com/apache/arrow/go/arrow/array"
)
// AppenderFunc is the function to be used to convert the data to the correct type.
type AppenderFunc func(array.Builder, interface{})
// SmartBuilder knows how to convert to the correct type when building.
type SmartBuilder struct {
recordBuilder *array.RecordBuilder
schema *arrow.Schema
fieldAppenders []AppenderFunc
}
// NewSmartBuilder creates a SmartBuilder that knows how to convert to the correct type when building.
func NewSmartBuilder(recordBuilder *array.RecordBuilder, schema *arrow.Schema) *SmartBuilder {
sb := &SmartBuilder{
recordBuilder: recordBuilder,
schema: schema,
fieldAppenders: make([]AppenderFunc, 0, len(schema.Fields())),
}
fields := sb.schema.Fields()
for i := range fields {
fn := initFieldAppender(&fields[i])
sb.fieldAppenders = append(sb.fieldAppenders, fn)
}
return sb
}
// Append will append the value to the builder.
func (sb *SmartBuilder) Append(fieldIndex int, v interface{}) {
field := sb.recordBuilder.Field(fieldIndex)
appendFunc := sb.fieldAppenders[fieldIndex]
if appendFunc == nil {
fmt.Fprintln(os.Stderr, "warn: appendFunc is nil")
}
appendFunc(field, v)
}
func initFieldAppender(field *arrow.Field) AppenderFunc {
switch field.Type.(type) {
case *arrow.BooleanType:
return func(field array.Builder, v interface{}) {
builder := field.(*array.BooleanBuilder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(bool)
builder.Append(vT)
}
}
case *arrow.Int8Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Int8Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(int8)
builder.Append(vT)
}
}
case *arrow.Int16Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Int16Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(int16)
builder.Append(vT)
}
}
case *arrow.Int32Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Int32Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(int32)
builder.Append(vT)
}
}
case *arrow.Int64Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Int64Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(int64)
builder.Append(vT)
}
}
case *arrow.Uint8Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Uint8Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(uint8)
builder.Append(vT)
}
}
case *arrow.Uint16Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Uint16Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(uint16)
builder.Append(vT)
}
}
case *arrow.Uint32Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Uint32Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(uint32)
builder.Append(vT)
}
}
case *arrow.Uint64Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Uint64Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(uint64)
builder.Append(vT)
}
}
case *arrow.Float32Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Float32Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(float32)
builder.Append(vT)
}
}
case *arrow.Float64Type:
return func(field array.Builder, v interface{}) {
builder := field.(*array.Float64Builder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(float64)
builder.Append(vT)
}
}
case *arrow.StringType:
return func(field array.Builder, v interface{}) {
builder := field.(*array.StringBuilder)
if v == nil {
builder.AppendNull()
} else {
vT := v.(string)
builder.Append(vT)
}
}
default:
panic(fmt.Errorf("dataframe/smartbuilder: unhandled field type %T", field.Type))
}
}