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
175
176
177
178
|
package mapr
import (
"errors"
"fmt"
"io/ioutil"
"sort"
"strconv"
"strings"
)
// GroupSet represents a map of aggregate sets. The group sets
// are requierd by the "group by" mapr clause, whereas the
// group set map keys are the values of the "group by" arguments.
// E.g. "group by $cid" would create one aggregate set and one map
// entry per customer id.
type GroupSet struct {
sets map[string]*AggregateSet
}
// NewGroupSet returns a new empty group set.
func NewGroupSet() *GroupSet {
g := GroupSet{}
g.InitSet()
return &g
}
// String representation of the group set.
func (g *GroupSet) String() string {
return fmt.Sprintf("GroupSet(%v)", g.sets)
}
// InitSet makes the group set empty (initialize).
func (g *GroupSet) InitSet() {
g.sets = make(map[string]*AggregateSet)
}
// GetSet gets a specific aggregate set from the group set.
func (g *GroupSet) GetSet(groupKey string) *AggregateSet {
set, ok := g.sets[groupKey]
if !ok {
set = NewAggregateSet()
g.sets[groupKey] = set
}
return set
}
// Serialize the group set (e.g. to send it over the wire).
func (g *GroupSet) Serialize(ch chan<- string, stop chan struct{}) {
for groupKey, set := range g.sets {
set.Serialize(groupKey, ch, stop)
}
}
// Result returns a nicely formated result of the query from the group set.
func (g *GroupSet) Result(query *Query) (string, int, error) {
return g.limitedResult(query, query.Limit, "\t", " ", false)
}
// WriteResult writes the result to an outfile.
func (g *GroupSet) WriteResult(query *Query) error {
if query.Outfile == "" {
return errors.New("No outfile specified")
}
// -1: Don't limit the result, include all data sets
result, _, err := g.limitedResult(query, -1, "", ",", true)
if err != nil {
return err
}
return ioutil.WriteFile(query.Outfile, []byte(result), 0644)
}
// Return a nicely formated result of the query from the group set.
func (g *GroupSet) limitedResult(query *Query, limit int, lineStarter, fieldSeparator string, addHeader bool) (string, int, error) {
type result struct {
groupKey string
resultStr string
orderBy float64
}
var resultSlice []result
for groupKey, set := range g.sets {
var sb strings.Builder
r := result{groupKey: groupKey}
lastIndex := len(query.Select) - 1
for i, sc := range query.Select {
storage := sc.FieldStorage
orderByThis := storage == query.OrderBy
switch sc.Operation {
case Count:
value := set.FValues[storage]
sb.WriteString(fmt.Sprintf("%d", int(value)))
if orderByThis {
r.orderBy = value
}
case Len:
fallthrough
case Sum:
fallthrough
case Min:
fallthrough
case Max:
value := set.FValues[storage]
sb.WriteString(fmt.Sprintf("%f", value))
if orderByThis {
r.orderBy = value
}
case Last:
value := set.SValues[storage]
if orderByThis {
f, err := strconv.ParseFloat(value, 64)
if err == nil {
r.orderBy = f
}
}
sb.WriteString(value)
case Avg:
value := set.FValues[storage] / float64(set.Samples)
sb.WriteString(fmt.Sprintf("%f", value))
if orderByThis {
r.orderBy = value
}
default:
return "", 0, fmt.Errorf("Unknown aggregation method '%v'", sc.Operation)
}
if i != lastIndex {
sb.WriteString(fieldSeparator)
}
}
r.resultStr = sb.String()
resultSlice = append(resultSlice, r)
}
if query.OrderBy != "" {
if query.ReverseOrder {
sort.SliceStable(resultSlice, func(i, j int) bool {
return resultSlice[i].orderBy < resultSlice[j].orderBy
})
} else {
sort.SliceStable(resultSlice, func(i, j int) bool {
return resultSlice[i].orderBy > resultSlice[j].orderBy
})
}
}
var sb strings.Builder
// Write header first
if addHeader {
lastIndex := len(query.Select) - 1
sb.WriteString(lineStarter)
for i, sc := range query.Select {
sb.WriteString(sc.FieldStorage)
if i != lastIndex {
sb.WriteString(fieldSeparator)
}
}
sb.WriteString("\n")
}
// And now write the data
for i, r := range resultSlice {
if i == limit {
break
}
sb.WriteString(lineStarter)
sb.WriteString(r.resultStr)
sb.WriteString("\n")
}
return sb.String(), len(resultSlice), nil
}
|
