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json_type.go
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json_type.go
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// Copyright 2024 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"
"math"
"github.com/shopspring/decimal"
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/go-mysql-server/sql/expression"
"github.com/dolthub/go-mysql-server/sql/types"
)
// JSONType (json_val)
//
// Returns a utf8mb4 string indicating the type of a JSON value. This can be an object, an array, or a scalar type.
// JSONType returns NULL if the argument is NULL. An error occurs if the argument is not a valid JSON value
//
// https://dev.mysql.com/doc/refman/8.0/en/json-attribute-functions.html#function_json-type
type JSONType struct {
JSON sql.Expression
}
var _ sql.FunctionExpression = &JSONType{}
// NewJSONType creates a new JSONType function.
func NewJSONType(args ...sql.Expression) (sql.Expression, error) {
if len(args) != 1 {
return nil, sql.ErrInvalidArgumentNumber.New("JSON_TYPE", "1", len(args))
}
return &JSONType{JSON: args[0]}, nil
}
// FunctionName implements sql.FunctionExpression
func (j JSONType) FunctionName() string {
return "json_type"
}
// Description implements sql.FunctionExpression
func (j JSONType) Description() string {
return "returns type of JSON value."
}
// Resolved implements sql.Expression
func (j JSONType) Resolved() bool {
return j.JSON.Resolved()
}
// String implements fmt.Stringer
func (j JSONType) String() string {
return fmt.Sprintf("%s(%s)", j.FunctionName(), j.JSON.String())
}
// Type implements sql.Expression
func (j JSONType) Type() sql.Type {
return types.Text
}
// IsNullable implements sql.Expression
func (j JSONType) IsNullable() bool {
return j.JSON.IsNullable()
}
// Eval implements sql.Expression
func (j JSONType) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
span, ctx := ctx.Span(fmt.Sprintf("function.%s", j.FunctionName()))
defer span.End()
doc, err := getJSONDocumentFromRow(ctx, row, j.JSON)
if err != nil {
return nil, err
}
if doc == nil {
return "NULL", nil
}
switch v := doc.Val.(type) {
case nil:
return "NULL", nil
case bool:
return "BOOLEAN", nil
case int64:
return "INTEGER", nil
case uint64:
return "UNSIGNED INTEGER", nil
case float64:
if conv, ok := j.JSON.(*expression.Convert); ok {
typ := conv.Child.Type()
if types.IsUnsigned(typ) || types.IsYear(typ) {
return "UNSIGNED INTEGER", nil
}
}
if math.Floor(v) == v {
if v >= (math.MaxInt32+1)*2 {
return "UNSIGNED INTEGER", nil
}
return "INTEGER", nil
}
return "DOUBLE", nil
case string:
if conv, ok := j.JSON.(*expression.Convert); ok {
typ := conv.Child.Type()
if types.IsDatetimeType(typ) {
return "DATETIME", nil
}
if types.IsDateType(typ) {
return "DATE", nil
}
if types.IsTime(typ) {
return "TIME", nil
}
}
return "STRING", nil
case []interface{}:
return "ARRAY", nil
case map[string]interface{}:
return "OBJECT", nil
case decimal.Decimal:
return "DECIMAL", nil
default:
return "OPAQUE", nil
}
}
// Children implements sql.Expression
func (j JSONType) Children() []sql.Expression {
return []sql.Expression{j.JSON}
}
// WithChildren implements sql.Expression
func (j JSONType) WithChildren(children ...sql.Expression) (sql.Expression, error) {
return NewJSONType(children...)
}