presto-main/src/main/java/io/prestosql/operator/scalar/JsonPath.java/JsonPath/JsonPath
class JsonPath:    public JsonPath(String pattern)
    {
        scalarExtractor = JsonExtract.generateExtractor(pattern, new JsonExtract.ScalarValueJsonExtractor());
        objectExtractor = JsonExtract.generateExtractor(pattern, new JsonExtract.JsonValueJsonExtractor());
        sizeExtractor = JsonExtract.generateExtractor(pattern, new JsonExtract.JsonSizeExtractor());
    }