Meter on query complexity in the OSO API

[ryscheng]

What is it?

2 queries against the OSO API may not have the same cost on Clickhouse. We should add some way to estimate query complexity

[ryscheng]

Clickhouse queries return back with the results:

"statistics": {
    "elapsed": 0.00252127,
    "rows_read": 10,
    "bytes_read": 1728
  }