Difference between UPDATE and INSERT in Cassandra?

Question

What is the difference between UPDATE and INSERT when executing CQL against Cassandra?

It looks like there used to be no difference, but no

Answer 1

Another subtle difference (i'm starting to believe cql is a terrible interface to cassandra, full of subtleties and caveats due to using similar SQL syntax but slightly different semantics) is with setting TTLs on existing data. With UPDATE you cannot update the TTL of the keys, even if the new actual values are equal to the old values. The solution is to INSERT the new row instead, with the new TTL already set