Kefu Chai
41de3a17e1
api: move histogram data into future to avoid deep copying
...
Previously, we created a vector<utils_json::histogram> and returned it
by copying into a future. Since histogram is a JSON representation of
ihistogram, it can be heavyweight, making the vector copy overhead
significant.
Now we move the vector into the returned future instead of copying it,
eliminating the deep copy overhead. The APIs backed by this function
are marked deprecated, so this performance improvement is not that
important.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com >
Closes scylladb/scylladb#22004
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