CQL3: How to retrieve the TTL when there is only a primary key?

Question

I have a CQL table defined like this:

CREATE table primary_key_only(
  row_key varchar,
  clustered_key varchar,
  primary key(row_key, clustered_key)
)

Assuming I insert values like this:

INSERT INTO primary_key_only (row_key, clustered_key) VALUES ('FACE', 'D00D') USING TTL 86400;

How would I go about retrieving the TTL for the inserted data? Normally, if there was a CQL column that wasn't part of the primary key, then I could use a statement like:

SELECT ttl(<column_name>) FROM table WHERE row_key='key';

But since there are only primary key columns, functions like ttl and writetime won't work. How can I obtain the TTL, beyond adding an additional "dummy" column to the table that is not part of the primary key?

Answer 1

Just for the sake of any future visitors, as of 2.2 this is still not possible without adding a dummy column.