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sql: Add recent JSON functionality #632

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Sep 27, 2018
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sql: Add recent JSON functionality #632

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Add recent JSON functionality
morgo Sep 26, 2018
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Update json-functions-generated-column.md
morgo Sep 27, 2018
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6 changes: 5 additions & 1 deletion sql/json-functions-generated-column.md
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Expand Up @@ -66,10 +66,14 @@ In addition to inserting and querying data, TiDB also supports editing JSON. In
- [JSON_REMOVE](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-remove)
- [JSON_TYPE](https://dev.mysql.com/doc/refman/5.7/en/json-attribute-functions.html#function_json-type)
- [JSON_UNQUOTE](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-unquote)
- [JSON_MERGE](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-merge)
- [JSON_CONTAINS](https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#function_json-contains)
- [JSON_CONTAINS_PATH](https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#function_json-contains-path)
- [JSON_LENGTH](https://dev.mysql.com/doc/refman/5.7/en/json-attribute-functions.html#function_json-length)

You can get the general use of these functions directly from the function name. These functions in TiDB behave the same as in MySQL 5.7. For more information, see the [JSON Functions document of MySQL 5.7](https://dev.mysql.com/doc/refman/5.7/en/json-functions.html). If you are a user of MySQL 5.7, you can migrate to TiDB seamlessly.

Currently TiDB does not support all the JSON functions in MySQL 5.7. This is because our preliminary goal is to provide complete support for **MySQL X Plugin**, which covers the majority of JSON functions used to insert, select, update and delete data. More functions will be supported if necessary.
Currently TiDB does not support all the JSON functions in MySQL 5.7. You can track our progress in adding this functionality in [TiDB #7546](https://github.com/pingcap/tidb/issues/7546).

## Index JSON using generated column

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