| from_json(jsonStr, schema[, options]) | 
      Returns a struct value with the given `jsonStr` and `schema`. | 
    
    
      | get_json_object(json_txt, path) | 
      Extracts a json object from `path`. | 
    
    
      | json_array_length(jsonArray) | 
      Returns the number of elements in the outermost JSON array. | 
    
    
      | json_object_keys(json_object) | 
      Returns all the keys of the outermost JSON object as an array. | 
    
    
      | json_tuple(jsonStr, p1, p2, ..., pn) | 
      Returns a tuple like the function get_json_object, but it takes multiple names. All the input parameters and output column types are string. | 
    
    
      | schema_of_json(json[, options]) | 
      Returns schema in the DDL format of JSON string. | 
    
    
      | to_json(expr[, options]) | 
      Returns a JSON string with a given struct value |