[
https://issues.apache.org/jira/browse/CALCITE-2808?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Forward Xu updated CALCITE-2808:
--------------------------------
Description:
{{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) AS c1
,JSON_LENGTH(v, 'lax $.b' 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],"b": "[10, true]"}
')) AS t(v)
limit 10;
Result:
c1 c2 c3 c4
== == == ==
2 1 1 1
was:
{{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) AS c1
,JSON_LENGTH(JSON_VALUE(v, 'lax $.b' ERROR ON ERROR)) AS c2
,JSON_LENGTH(JSON_VALUE(v, 'strict $.a[0]' ERROR ON ERROR)) AS c3
,JSON_LENGTH(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
== == == ==
2 1 1 1
> 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
>
> {{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) AS c1
> ,JSON_LENGTH(v, 'lax $.b' 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],"b": "[10, true]"}
> ')) AS t(v)
> limit 10;
> Result:
> c1 c2 c3 c4
> == == == ==
> 2 1 1 1
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
