hi Hongze Zhang?? This makes sense to me, which is why I added the json_type function in the first place. Thank you very much. best qianjin
------------------ ???????? ------------------ ??????: "Hongze Zhang"<[email protected]>; ????????: 2019??2??1??(??????) ????2:20 ??????: "[email protected]"<[email protected]>; ????: Integrating MySQL's JSON functions Hi all, There is a PR CALCITE-2791[1] from xuqianjin about adding a MySQL function JSON_TYPE[2], and I want to know what do you think about it. JSON_TYPE is not a standard JSON function defined by SQL:2016. In MySQL the use of this function is to get the type of a JSON doc. The similar operator in Calcite 1.18.0 is "IS JSON (VALUE/SCALAR/OBJECT/ARRAY)", however sometimes JSON_TYPE can do more than it. As for other non-standard JSON functions, I made a simple summary table about JSON support (mainly as functions) details of some of most important SQL implementations. you can open it via link https://docs.google.com/spreadsheets/d/1A6vrEEu3WK49dJ5mfaYeMLFvAy0JR9uoJsiaKhxUal4/edit#gid=0 And I suggest to introduce some JSON functions that is from MySQL and might be useful for Calcite but not supported, not Just JSON_TYPE: 1. JSON_INSERT / JSON_SET / JSON_REPLACE /JSON_REMOVE [3] 2. JSON_DEPTH / JSON_LENGTH / JSON_TYPE [4] I think the PR[1] can be a good start. Does anyone have thought about this? Looking forward to your reply. [1] https://issues.apache.org/jira/browse/CALCITE-2791 [2] https://dev.mysql.com/doc/refman/8.0/en/json-attribute-functions.html#function_json-type [3] https://dev.mysql.com/doc/refman/8.0/en/json-modification-functions.html [4] https://dev.mysql.com/doc/refman/8.0/en/json-attribute-functions.html
