in jdbc-grpc-client/src/main/java/org/apache/kyuubi/grpc/client/SimpleBlockingJdbcClient.java [214:221]
public IsValidResp isValid(String connectionId, int timeout) {
IsValidReq.Builder builder = IsValidReq.newBuilder();
IsValidReq req = builder
.setConnectionId(ConnectionHandle.newBuilder().setId(connectionId).build())
.setTimeout(timeout)
.build();
return connectionBlockingStub.isValid(req);
}