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Details

    • Sub-task
    • Status: Closed
    • Major
    • Resolution: Fixed
    • None
    • 1.20.0
    • None

    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:

      // code placeholder
      SELECT JSON_LENGTH(v) AS c1
      ,JSON_LENGTH(v, 'lax $.a') AS c2
      ,JSON_LENGTH(v, 'strict $.a[0]') AS c3
      ,JSON_LENGTH(v, 'strict $.a[1]') 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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