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https://issues.apache.org/jira/browse/CALCITE-2808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated CALCITE-2808:
------------------------------------
Labels: pull-request-available (was: )
> Add the JSON_LENGTH function
> -----------------------------
>
> Key: CALCITE-2808
> URL: https://issues.apache.org/jira/browse/CALCITE-2808
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Forward Xu
> Assignee: Forward Xu
> Priority: Major
> Labels: pull-request-available
>
> {{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:
> SELECT JSON_LENGTH(v, 'lax $' ERROR ON ERROR
> ) AS c1
> ,JSON_LENGTH(v, 'lax $.b' ERROR ON ERROR) AS c2
> ,JSON_LENGTH(v, 'strict $.a[0]' with wapper) AS c3
> ,JSON_LENGTH(v, 'strict $.a[1]' with wapper) AS c4
> FROM (VALUES ('
> {"a": [10, true],"b": "[10, true]"}
> ')) AS t(v)
> limit 10;
> Result:
> c1 c2 c3 c4
> == == == ==
> 2 1 1 1
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