用curl检查计时https://clickhouse.yandex/docs/en/interfaces/http/https网址：stackoverflow.com/a/22625150
比较本地和远程
chhttp通常提供与tcp几乎相同的性能，对于较小的结果集（如10行），http可能更快

Again. The problem is not the HTTP.
Example:

time clickhouse-client -q "select number, arrayMap(x->sipHash64(number,x), range(10)) from numbers(10000)" >native.out
real    0m0.034s

time curl -S -o http.out 'http://localhost:8123/?query=select%20number%2C%20arrayMap(x-%3EsipHash64(number%2Cx)%2C%20range(10))%20from%20numbers(10000)'
real    0m0.017s

ls -l http.out native.out
2108707 Oct  1 16:17 http.out
2108707 Oct  1 16:17 native.out

10 000 rows - 2Mb

HTTP is faster 0.017s VS 0.034s

加拿大->德国（openvpn）

time curl -S -o http.out 'http://user:xxx@cl.host.x:8123/?query=select%20number%2C%20arrayMap(x-%3EsipHash64(number%2Cx)%2C%20range(10))%20from%20numbers(10000)'

real    0m1.619s

ping cl.host.x
PING cl.host.x (10.253.52.6): 56 data bytes
64 bytes from 10.253.52.6: icmp_seq=0 ttl=61 time=131.710 ms
64 bytes from 10.253.52.6: icmp_seq=1 ttl=61 time=133.711 ms