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
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
package engine
import (
"fmt"
"strings"
"time"
"github.com/seaweedfs/seaweedfs/weed/pb/schema_pb"
)
// ===============================
// DATE/TIME CONSTANTS
// ===============================
// CurrentDate returns the current date as a string in YYYY-MM-DD format
func (e *SQLEngine) CurrentDate() (*schema_pb.Value, error) {
now := time.Now()
dateStr := now.Format("2006-01-02")
return &schema_pb.Value{
Kind: &schema_pb.Value_StringValue{StringValue: dateStr},
}, nil
}
// CurrentTimestamp returns the current timestamp
func (e *SQLEngine) CurrentTimestamp() (*schema_pb.Value, error) {
now := time.Now()
// Return as TimestampValue with microseconds
timestampMicros := now.UnixMicro()
return &schema_pb.Value{
Kind: &schema_pb.Value_TimestampValue{
TimestampValue: &schema_pb.TimestampValue{
TimestampMicros: timestampMicros,
},
},
}, nil
}
// CurrentTime returns the current time as a string in HH:MM:SS format
func (e *SQLEngine) CurrentTime() (*schema_pb.Value, error) {
now := time.Now()
timeStr := now.Format("15:04:05")
return &schema_pb.Value{
Kind: &schema_pb.Value_StringValue{StringValue: timeStr},
}, nil
}
// Now is an alias for CurrentTimestamp (common SQL function name)
func (e *SQLEngine) Now() (*schema_pb.Value, error) {
return e.CurrentTimestamp()
}
// ===============================
// EXTRACT FUNCTION
// ===============================
// DatePart represents the part of a date/time to extract
type DatePart string
const (
PartYear DatePart = "YEAR"
PartMonth DatePart = "MONTH"
PartDay DatePart = "DAY"
PartHour DatePart = "HOUR"
PartMinute DatePart = "MINUTE"
PartSecond DatePart = "SECOND"
PartWeek DatePart = "WEEK"
PartDayOfYear DatePart = "DOY"
PartDayOfWeek DatePart = "DOW"
PartQuarter DatePart = "QUARTER"
PartEpoch DatePart = "EPOCH"
)
// Extract extracts a specific part from a date/time value
func (e *SQLEngine) Extract(part DatePart, value *schema_pb.Value) (*schema_pb.Value, error) {
if value == nil {
return nil, fmt.Errorf("EXTRACT function requires non-null value")
}
// Convert value to time
t, err := e.valueToTime(value)
if err != nil {
return nil, fmt.Errorf("EXTRACT function time conversion error: %v", err)
}
var result int64
switch strings.ToUpper(string(part)) {
case string(PartYear):
result = int64(t.Year())
case string(PartMonth):
result = int64(t.Month())
case string(PartDay):
result = int64(t.Day())
case string(PartHour):
result = int64(t.Hour())
case string(PartMinute):
result = int64(t.Minute())
case string(PartSecond):
result = int64(t.Second())
case string(PartWeek):
_, week := t.ISOWeek()
result = int64(week)
case string(PartDayOfYear):
result = int64(t.YearDay())
case string(PartDayOfWeek):
result = int64(t.Weekday())
case string(PartQuarter):
month := t.Month()
result = int64((month-1)/3 + 1)
case string(PartEpoch):
result = t.Unix()
default:
return nil, fmt.Errorf("unsupported date part: %s", part)
}
return &schema_pb.Value{
Kind: &schema_pb.Value_Int64Value{Int64Value: result},
}, nil
}
// ===============================
// DATE_TRUNC FUNCTION
// ===============================
// DateTrunc truncates a date/time to the specified precision
func (e *SQLEngine) DateTrunc(precision string, value *schema_pb.Value) (*schema_pb.Value, error) {
if value == nil {
return nil, fmt.Errorf("DATE_TRUNC function requires non-null value")
}
// Convert value to time
t, err := e.valueToTime(value)
if err != nil {
return nil, fmt.Errorf("DATE_TRUNC function time conversion error: %v", err)
}
var truncated time.Time
switch strings.ToLower(precision) {
case "microsecond", "microseconds":
// No truncation needed for microsecond precision
truncated = t
case "millisecond", "milliseconds":
truncated = t.Truncate(time.Millisecond)
case "second", "seconds":
truncated = t.Truncate(time.Second)
case "minute", "minutes":
truncated = t.Truncate(time.Minute)
case "hour", "hours":
truncated = t.Truncate(time.Hour)
case "day", "days":
truncated = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
case "week", "weeks":
// Truncate to beginning of week (Monday)
days := int(t.Weekday())
if days == 0 { // Sunday = 0, adjust to make Monday = 0
days = 6
} else {
days = days - 1
}
truncated = time.Date(t.Year(), t.Month(), t.Day()-days, 0, 0, 0, 0, t.Location())
case "month", "months":
truncated = time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
case "quarter", "quarters":
month := t.Month()
quarterMonth := ((int(month)-1)/3)*3 + 1
truncated = time.Date(t.Year(), time.Month(quarterMonth), 1, 0, 0, 0, 0, t.Location())
case "year", "years":
truncated = time.Date(t.Year(), 1, 1, 0, 0, 0, 0, t.Location())
case "decade", "decades":
year := (t.Year() / 10) * 10
truncated = time.Date(year, 1, 1, 0, 0, 0, 0, t.Location())
case "century", "centuries":
year := ((t.Year()-1)/100)*100 + 1
truncated = time.Date(year, 1, 1, 0, 0, 0, 0, t.Location())
case "millennium", "millennia":
year := ((t.Year()-1)/1000)*1000 + 1
truncated = time.Date(year, 1, 1, 0, 0, 0, 0, t.Location())
default:
return nil, fmt.Errorf("unsupported date truncation precision: %s", precision)
}
// Return as TimestampValue
return &schema_pb.Value{
Kind: &schema_pb.Value_TimestampValue{
TimestampValue: &schema_pb.TimestampValue{
TimestampMicros: truncated.UnixMicro(),
},
},
}, nil
}
|
