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JSON Functions
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.. function:: json_extract_path_text (string json, string xpath)
  Extracts JSON string from a JSON string based on json path specified and returns JSON string pointed to by xPath

  :param string:
  :param string:
  :rtype: text
  :example:

  .. code-block:: sql

    json_extract_path_text('{"test" : {"key" : "tajo"}}','$.test.key');
    > tajo