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This patch enables the per-row TTL feature in CQL (Refs #13000). This patch allows the user to create a new table with one of its columns designated as the TTL column with a syntax like: CREATE TABLE tab ( id int PRIMARY KEY, t text, expiration timestamp TTL ); The column marked "TTL" must have the "timestamp", "bigint" or "int" types (the choice of these types was explained in the previous patch), and there can only be one such column. We decided not to allow a column to be both a primary key column and a TTL column - although it would have worked (it's supported in Alternator), I considered this non-useful and confusing, and decided not to allow it in CQL. A TTL column also can't be a static column. We save the information of which column is the TTL column in a tag which is read by the "expiration service" - originally a part of Alternator's TTL implementation. After the previous patch, the expiration service is running and knows how to understand CQL tables, so the CQL per-row TTL feature will start to work. This patch also implements DESC TABLE, printing the word "TTL" in the right place of the output. This patch doesn't yet implement ALTER TABLE that should allow enabling or disabling the TTL column setting on an existing table - we'll do that in the next patch. A large collection of functional tests (in test/cqlpy), for every detail of this feature will be added in a later patch. Signed-off-by: Nadav Har'El <nyh@scylladb.com>