Table API function and expression vs SQL

[ravi_suryavanshi.yahoo.com via user]

Hello Team,Need your advice on which method is recommended considering don't 
want to change my query code when the Flink is updated/upgraded to the higher 
version.
Here I am seeking advice for writing the SQL using java code(Table API  
function and Expression) or using pure SQL.
I am assuming that SQL will not have any impact if upgraded to the higher 
version.
Thanks and Regards,Ravi