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sql: Add JSON_MERGE_PRESERVE #864

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Jan 23, 2019
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sql: Add JSON_MERGE_PRESERVE #864

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5 changes: 3 additions & 2 deletions sql/json-functions.md
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Original file line number Diff line number Diff line change
Expand Up @@ -31,7 +31,8 @@ TiDB supports most of the JSON functions that shipped with the GA release of MyS
| Function Name and Syntactic Sugar | Description |
| --------------------------------- | ----------- |
| [JSON_INSERT(json_doc, path, val[, path, val] ...)][json_insert] | Inserts data into a JSON document and returns the result |
| [JSON_MERGE(json_doc, json_doc[, json_doc] ...)][json_merge] | Merges two or more JSON documents and returns the merged result |
| [JSON_MERGE(json_doc, json_doc[, json_doc] ...)][json_merge] | A deprecated alias for `JSON_MERGE_PRESERVE` |
| [JSON_MERGE_PRESERVE(json_doc, json_doc[, json_doc] ...)][json_merge_preserve] | Merges two or more JSON documents and returns the merged result |
| [JSON_REMOVE(json_doc, path[, path] ...)][json_remove] | Removes data from a JSON document and returns the result |
| [JSON_REPLACE(json_doc, path, val[, path, val] ...)][json_replace] | Replaces existing values in a JSON document and returns the result |
| [JSON_SET(json_doc, path, val[, path, val] ...)][json_set] | Inserts or updates data in a JSON document and returns the result |
Expand All @@ -52,7 +53,6 @@ The following JSON functions are unsupported in TiDB. You can track the progress
* `JSON_APPEND` and its alias `JSON_ARRAY_APPEND`
* `JSON_ARRAY_INSERT`
* `JSON_MERGE_PATCH`
* `JSON_MERGE_PRESERVE`, use the alias `JSON_MERGE` instead
* `JSON_PRETTY`
* `JSON_QUOTE`
* `JSON_SEARCH`
Expand All @@ -71,6 +71,7 @@ The following JSON functions are unsupported in TiDB. You can track the progress
[json_replace]: https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-replace
[json_remove]: https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-remove
[json_merge]: https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-merge
[json_merge_preserve]: https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-merge-preserve
[json_object]: https://dev.mysql.com/doc/refman/5.7/en/json-creation-functions.html#function_json-object
[json_array]: https://dev.mysql.com/doc/refman/5.7/en/json-creation-functions.html#function_json-array
[json_keys]: https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#function_json-keys
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