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21a7b036a5
During forwarding of CQL EXECUTE requests, the target node may not have the prepared statement in its cache. If we do have this statement as a coordinator, instead of returning PREPARED NOT FOUND to the client, we want to prepare the statement ourselves on target node. For that, we add a new FORWARD_CQL_PREPARE RPC. We use the new RPC after gettting the prepared_not_found status during forwarding. When we try to forward a request, we always have the query string (we decide whether to forward based on this query), so we can always use the new RPC when getting the prepared_not_found status. After receiving the response, we try forwarding the EXECUTE request again.