Michał Sala fff454761a messaging_service: add verb for count(*) request forwarding ...

Except for the verb addition, this commit also defines forward_request
and forward_result structures, used as an argument and result of the new
rpc. forward_request is used to forward information about select
statement that does count(*) (or other aggregating functions such as
max, min, avg in the future). Due to the inability to serialize
cql3::statements::select_statement, I chose to include
query::read_command, dht::partition_range_vector and some configuration
options in forward_request. They can be serialized and are sufficient
enough to allow creation of service::pager::query_pagers::pager.

2022-02-01 21:14:41 +01:00

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