[jira] [Created] (CALCITE-2880) Add the JSON_PRETTY function

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

Ritesh created CALCITE-2880:
-------------------------------

             Summary: Add the JSON_PRETTY function 
                 Key: CALCITE-2880
                 URL: https://issues.apache.org/jira/browse/CALCITE-2880
             Project: Calcite
          Issue Type: Sub-task
            Reporter: Ritesh
            Assignee: Forward Xu


```
JSON_LENGTH(**json_doc**[, *path*])
```

Returns the length of a JSON document, or, if a *path* argument is given, the length of the value within the document identified by the path. Returns `NULL` if any argument is `NULL` or the *path* argument does not identify a value in the document. An error occurs if the *json_doc* argument is not a valid JSON document or the *path* argument is not a valid path expression or contains a \{**} or }}**{{`*` wildcard.

The length of a document is determined as follows:

- The length of a scalar is 1.

- The length of an array is the number of array elements.

- The length of an object is the number of object members.

- The length does not count the length of nested arrays or objects.

Example Sql:

```sql
SELECT JSON_LENGTH(v, 'lax $' ERROR ON ERROR) AS c1
,JSON_LENGTH(v, 'lax $.a' ERROR ON ERROR) AS c2
,JSON_LENGTH(v, 'strict $.a[0]' ERROR ON ERROR) AS c3
,JSON_LENGTH(v, 'strict $.a[1]' ERROR ON ERROR) AS c4
FROM (VALUES ('\{"a": [10, true]}')) AS t(v)
limit 10;
```

Result:

| c1 | c2 | c3 | c4 |
| ---- | ---- | ---- | ---- |
| 1 | 2 | 1 | 1 |

 



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