Pekka Enberg be0351b49c cql3: Introduce raw_value and raw_value_view types ...

Currently, the code is using bytes_opt and bytes_view_opt to represent
CQL values, which can hold a value or null. In preparation for
supporting a third state, unset value introduced in CQL v4, introduce
new raw_value and raw_value_view types and use them instead.

The new types are based on boost::variant<> and are capable of holding
null, unset values, and blobs that represent a value.

2017-01-26 13:50:04 +02:00

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