Hello, Thanks for response. I don't think it is necessary to have country_id as key in City. Because in the official documentation of ignite here https://ignite.apache.org/features/collocatedprocessing.html (See SQL schema) they haven't used 'Code CHAR(3)' as key in City table.
By the way, if you know the schema for which collocation is working, please share with us . Thanks -- Sent from: http://apache-ignite-users.70518.x6.nabble.com/
