- Add a test for ALTER TABLE

- Add capability to retry calls that have failed with UnavailableException or
  [Cassandra's] TimedOutException. 
- We don't retry for Thrift errors yet, although could easily do, now.

- Support mapping Cassandra's timestamp to INT64
- Support mapping Cassadnra's decimal to VARBINARY.

- allow only VARBINARY(n), all other types can get meaningless data after conversions
- more comments

- Add support for Cassandra's 'varint' datatype, mappable to VARBINARY.

- Added @@cassandra_thrift_host global variable.

- added option thrift_port which allows to specify which port to connect to
- not adding username/password - it turns out, there are no authentication
  schemes in stock cassandra distribution.

- Use more permissive locking.

- Also provide handling for generic Thrift exceptions. These are not listed in the 'throws' clause
  of API definition but still can happen.

- Catch all kinds of exceptions when calling Thrift code.

Cassandra SE: small optimization: StringCopyConverter::mariadb_to_cassandra doesn't need to make NULL-terminated strings.

- Make cassandra.test drop and re-crate the test keyspace.

- Make an attempt at fixing.

- add support for Cassandra's UUID datatype. We map it to CHAR(36).

- Add mapping for INT datatype
- Primary key column should now be named like CQL's primary key, 
  or 'rowkey' if CF has key_alias.

- Full table scan internally uses LIMIT n, and re-starts the scan from
  the last seen rowkey value.  rowkey ranges are inclusive, so we will
  see the same rowkey again. We should ignore it.

- Remove HTON_CAN_RECREATE flag, re-create won't delete rows in cassandra.

- We use HA_MRR_NO_ASSOC ("optimizer_switch=join_cache_hashed") mode
- Not able to use BKA's buffers yet.
- There is a variable to control batch size
- There are status counters.
- Nedeed to make some fixes in BKA code (to be checked with Igor)

- bulk inserts themselves
- control variable and counters.

- preparations for support of bulk INSERT.

- Fix typo in ha_cassandra::rnd_pos().
- in ::index_read_map(), do not assume that pk column is part of table->read_set.

- Partial support for DELETE ... WHERE.

- Descriptive error messages
- Unpack PK column on range scans

- Support "DELETE FROM cassandra_table"

- Got range reads to work (except for unpacking of the rowkey value)

- Introduce type converters (so far rather trivial)
- switch INSERT to using batch_mutate()

When appliying parent combinations to the overlay,
filter them through the %skip_combinations using the overlayed filename