How could I elog the tupleTableSlot to the fronted terminal?

For example, I use "insert into t values(1)"; and I 'll get a tupleTableSlot,

And Now I want to get the real data , that's 1, and then use elog() func
to print it. Could you give me some codes to realize that? futhermore,
what If the data type is text or other types? What do I need to change?
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