presto-main/src/main/java/io/prestosql/operator/scalar/JsonFunctions.java/JsonFunctions/varcharJsonArrayGet
class JsonFunctions:    @SqlNullable
    @ScalarFunction("json_array_get")
    @LiteralParameters("x")
    @SqlType(StandardTypes.JSON)
    public static Slice varcharJsonArrayGet(@SqlType("varchar(x)") Slice json, @SqlType(StandardTypes.BIGINT) long index)
    {
        return jsonArrayGet(json, index);
    }