[jira] [Created] (CALCITE-2884) Add the JSON_INSERT function

["Forward Xu (JIRA)" <ji...@apache.org>]

Forward Xu created CALCITE-2884:
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             Summary: Add the JSON_INSERT function
                 Key: CALCITE-2884
                 URL: https://issues.apache.org/jira/browse/CALCITE-2884
             Project: Calcite
          Issue Type: New Feature
            Reporter: Forward Xu


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].

Example 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]"}|

 



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