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https://issues.apache.org/jira/browse/CALCITE-2808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16753320#comment-16753320
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Stamatis Zampetakis commented on CALCITE-2808:
----------------------------------------------
Hi [~x1q1j1], I suppose you opened CALCITE-2809 and CALCITE-2810 by accident.
Can you please close them?
> Add the JSON_LENGTH function
> -----------------------------
>
> Key: CALCITE-2808
> URL: https://issues.apache.org/jira/browse/CALCITE-2808
> Project: Calcite
> Issue Type: Improvement
> Reporter: xuqianjin
> Assignee: Julian Hyde
> Priority: Major
>
> {{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.
> SELECT JSON_LENGTH('[1, 2, \\{"a": 3}]');
> +---------------------------------+
> |JSON_LENGTH('[1, 2, \\{"a": 3}]')|
> +---------------------------------+
> | 3|
> +---------------------------------+
> SELECT JSON_LENGTH('\{"a": 1, "b": {"c": 30}}');
> +-----------------------------------------+
> |JSON_LENGTH('\{"a": 1, "b": {"c": 30}}')|
> +-----------------------------------------+
> | 2|
> +-----------------------------------------+
> SELECT JSON_LENGTH('\{"a": 1, "b": {"c": 30}}', '$.b');
> +------------------------------------------------+
> |JSON_LENGTH('\{"a": 1, "b": {"c": 30}}', '$.b')|
> +------------------------------------------------+
> | 1|
> +------------------------------------------------+
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