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json_replace.go
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json_replace.go
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// Copyright 2023 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_REPLACE(json_doc, path, val[, path, val] ...)
//
// JSONReplace Replaces existing values in a JSON document and returns the result. Returns NULL if any argument is NULL.
// An error occurs if the json_doc argument is not a valid JSON document or any path argument is not a valid path
// expression or contains a * or ** wildcard. The path-value pairs are evaluated left to right. The document produced by
// evaluating one pair becomes the new value against which the next pair is evaluated. A path-value pair for an existing
// path in the document overwrites the existing document value with the new value. A path-value pair for a non-existing
// path in the document is ignored and has no effect.
//
// https://dev.mysql.com/doc/refman/8.0/en/json-modification-functions.html#function_json-replace
type JSONReplace struct {
doc sql.Expression
pathVals []sql.Expression
}
var _ sql.FunctionExpression = JSONReplace{}
func (j JSONReplace) Resolved() bool {
for _, child := range j.Children() {
if child != nil && !child.Resolved() {
return false
}
}
return true
}
func (j JSONReplace) 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 JSONReplace) Type() sql.Type {
return types.JSON
}
func (j JSONReplace) IsNullable() bool {
for _, arg := range j.pathVals {
if arg.IsNullable() {
return true
}
}
return j.doc.IsNullable()
}
func (j JSONReplace) Eval(ctx *sql.Context, row sql.Row) (interface{}, error) {
doc, err := getMutableJSONVal(ctx, row, j.doc)
if err != nil || doc == nil {
return nil, err
}
pairs := make([]pathValPair, 0, len(j.pathVals)/2)
for i := 0; i < len(j.pathVals); i += 2 {
argPair, err := buildPathValue(ctx, j.pathVals[i], j.pathVals[i+1], row)
if argPair == nil || err != nil {
return nil, err
}
pairs = append(pairs, *argPair)
}
// Apply the path-value pairs to the document.
for _, pair := range pairs {
doc, _, err = doc.Replace(pair.path, pair.val)
if err != nil {
return nil, err
}
}
return doc, nil
}
func (j JSONReplace) Children() []sql.Expression {
return append([]sql.Expression{j.doc}, j.pathVals...)
}
func (j JSONReplace) WithChildren(children ...sql.Expression) (sql.Expression, error) {
if len(j.Children()) != len(children) {
return nil, fmt.Errorf("json_replace did not receive the correct amount of args")
}
return NewJSONReplace(children...)
}
// NewJSONReplace creates a new JSONReplace function.
func NewJSONReplace(args ...sql.Expression) (sql.Expression, error) {
if len(args) <= 1 {
return nil, sql.ErrInvalidArgumentNumber.New("JSON_REPLACE", "more than 1", len(args))
} else if (len(args)-1)%2 == 1 {
return nil, sql.ErrInvalidArgumentNumber.New("JSON_REPLACE", "even number of path/val", len(args)-1)
}
return JSONReplace{args[0], args[1:]}, nil
}
// FunctionName implements sql.FunctionExpression
func (j JSONReplace) FunctionName() string {
return "json_replace"
}
// Description implements sql.FunctionExpression
func (j JSONReplace) Description() string {
return "replaces values in JSON document."
}
// IsUnsupported implements sql.UnsupportedFunctionStub
func (j JSONReplace) IsUnsupported() bool {
return false
}