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42a1ced73b
The expression system uses managed_bytes_opt for values, but result_set uses bytes_opt. This means that processing values from the result set in expressions requires a copy. Out of the two, managed_bytes_opt is the better choice, since it prevents large contiguous allocations for large blobs. So we switch result_set to use managed_bytes_opt. Users of the result_set API are adjusted. The db::function interface is not modified to limit churn; instead we convert the types on entry and exit. This will be adjusted in a following patch.