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5a15bed569
Changes summary: * make `cql3::result_set` movable-only * change signature of `cql3::result::result_set` to return by cref * adjust available call sites to the aforementioned method to accept cref Motivation behind this change is elimination of dangerous API, which can easily set a trap for developers who don't expect that result_set would be returned by value. There is no point in copying the `result_set` around, so make `cql3::result::result_set` to cache `result_set` internally in a `unique_ptr` member variable and return a const reference so to minimize unnecessary copies here and there. Tests: unit(debug) Signed-off-by: Pavel Solodovnikov <pa.solodovnikov@scylladb.com> Message-Id: <20191220115100.21528-1-pa.solodovnikov@scylladb.com>