@gchandra  I'm aware that I can use .safeToJson() but did you see the code of  py4j.security.WhitelistingPy4JSecurityManager ? How it works what can be whitelist what can't be whitelist ? I don't see py4j.security.WhitelistingPy4JSecurityManager on official py4j github. Is this code is closed and owned by Databricks ?