-
-
Notifications
You must be signed in to change notification settings - Fork 195
/
json_object.go
131 lines (106 loc) · 3.41 KB
/
json_object.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
// Copyright 2021 Dolthub, Inc.
//
// Licensed 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 json
import (
"fmt"
"strings"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/types"
)
// JSON_OBJECT([key, val[, key, val] ...])
// https://dev.mysql.com/doc/refman/8.0/en/json-creation-functions.html#function_json-object
// JSONObject Evaluates a (possibly empty) list of key-value pairs and returns a JSON object containing those pairs. An
// error occurs if any key name is NULL or the number of arguments is odd.
type JSONObject struct {
keyValPairs []sql.Expression
}
var _ sql.FunctionExpression = JSONObject{}
var _ sql.CollationCoercible = JSONObject{}
// NewJSONObject creates a new JSONObject function.
func NewJSONObject(exprs ...sql.Expression) (sql.Expression, error) {
if len(exprs)%2 != 0 {
return nil, sql.ErrInvalidArgumentNumber.New("JSON_OBJECT", "an even number of", len(exprs))
}
return JSONObject{keyValPairs: exprs}, nil
}
// FunctionName implements sql.FunctionExpression
func (j JSONObject) FunctionName() string {
return "json_object"
}
// Description implements sql.FunctionExpression
func (j JSONObject) Description() string {
return "creates JSON object."
}
// IsUnsupported implements sql.UnsupportedFunctionStub
func (j JSONObject) IsUnsupported() bool {
return false
}
func (j JSONObject) Resolved() bool {
for _, child := range j.Children() {
if child != nil && !child.Resolved() {
return false
}
}
return true
}
func (j JSONObject) String() string {
children := j.Children()
var parts = make([]string, len(children))
for i, c := range children {
parts[i] = c.String()
}
return fmt.Sprintf("%s(%s)", j.FunctionName(), strings.Join(parts, ","))
}
func (j JSONObject) Type() sql.Type {
return types.JSON
}
// CollationCoercibility implements the interface sql.CollationCoercible.
func (JSONObject) CollationCoercibility(ctx *sql.Context) (collation sql.CollationID, coercibility byte) {
return ctx.GetCharacterSet().BinaryCollation(), 2
}
func (j JSONObject) IsNullable() bool {
return false
}
func (j JSONObject) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
obj := make(map[string]interface{}, len(j.keyValPairs)/2)
var key string
for i, expr := range j.keyValPairs {
val, err := expr.Eval(ctx, row)
if err != nil {
return nil, err
}
if i%2 == 0 {
val, _, err := types.LongText.Convert(val)
if err != nil {
return nil, err
}
key = val.(string)
} else {
if json, ok := val.(sql.JSONWrapper); ok {
val = json.ToInterface()
}
obj[key] = val
}
}
return types.JSONDocument{Val: obj}, nil
}
func (j JSONObject) Children() []sql.Expression {
return j.keyValPairs
}
func (j JSONObject) WithChildren(children ...sql.Expression) (sql.Expression, error) {
if len(j.Children()) != len(children) {
return nil, fmt.Errorf("json_object did not receive the correct amount of args")
}
return NewJSONObject(children...)
}