[jira] [Assigned] (CALCITE-2864) Add the JSON_DEPTH function

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

     [ https://issues.apache.org/jira/browse/CALCITE-2864?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Forward Xu reassigned CALCITE-2864:
-----------------------------------

    Assignee: Forward Xu

> Add the JSON_DEPTH function
> ---------------------------
>
>                 Key: CALCITE-2864
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2864
>             Project: Calcite
>          Issue Type: Sub-task
>            Reporter: Forward Xu
>            Assignee: Forward Xu
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Returns the maximum depth of a JSON document. Returns {{NULL}} if the argument is {{NULL}}. An error occurs if the argument is not a valid JSON document.
> An empty array, empty object, or scalar value has depth 1. A nonempty array containing only elements of depth 1 or nonempty object containing only member values of depth 1 has depth 2. Otherwise, a JSON document has depth greater than 2.
>  
> Example Sql:
> SELECT JSON_DEPTH(v) AS c1
>  ,JSON_DEPTH(JSON_VALUE(v, 'lax $.b' ERROR ON ERROR)) AS c2
>  ,JSON_DEPTH(JSON_VALUE(v, 'strict $.a[0]' ERROR ON ERROR)) AS c3
>  ,JSON_DEPTH(JSON_VALUE(v, 'strict $.a[1]' ERROR ON ERROR)) AS c4
> FROM (VALUES ('{"a": [10, true],"b": "[10, true]"}')) AS t(v)
>  limit 10;
> Result:
> c1 c2 c3 c4
>  == == == == 
>  3   2   1   1



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