XuQianJin-Stars opened a new pull request #1143: [CALCITE-2884] Add the JSON_INSERT,JSON_REPLACE,JSON_SET function URL: https://github.com/apache/calcite/pull/1143 `JSON_INSERT`(jsondoc, path, val[, path, val] ) `JSON_REPLACE`(jsondoc, _path_, _val_[, path, val] ) `JSON_SET`(jsondoc, path, _val[, path, val] ) Inserts data into 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 is ignored and does not overwrite the existing document value. A path-value pair for a nonexisting path in the document adds the value to the document if the path identifies one of these types of values: * A member not present in an existing object. The member is added to the object and associated with the new value. * A position past the end of an existing array. The array is extended with the new value. If the existing value is not an array, it is autowrapped as an array, then extended with the new value. Otherwise, a path-value pair for a nonexisting path in the document is ignored and has no effect. For a comparison of [JSON_INSERT()](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-insert), [JSON_REPLACE()](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-replace), and [JSON_SET()](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-set), see the discussion of [JSON_SET()](https://dev.mysql.com/doc/refman/5.7/en/json-modification-functions.html#function_json-set). JSON_INSERT SQL: ``` SELECT JSON_INSERT(v, '$.a', 10, '$.c', '[true, false]') AS c1 FROM (VALUES ('{ "a": 1, "b": [2, 3]}')) AS t(v); ``` Result: | c1 | | ------------------------------------------- | | {"a": 1, "b": [2, 3], "c": "[true, false]"} | JSON_REPLACE SQL: ``` SELECT JSON_REPLACE(v, '$.a', 10, '$.c', '[true, false]') AS c1 FROM (VALUES ('{ "a": 1, "b": [2, 3]}')) AS t(v); ``` Result: | c1 | | ----------------------- | | {"a": 10, "b": [2, 3],} | JSON_SET SQL: ``` SELECT JSON_INSERT(v, '$.a', 10, '$.c', '[true, false]') AS c1 FROM (VALUES ('{ "a": 1, "b": [2, 3]}')) AS t(v); ``` Result: | c1 | | -------------------------------------------- | | {"a": 10, "b": [2, 3], "c": "[true, false]"} |
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