The Data, Totals and Extremes can be compressed.
Hello
Response to client hello.
Exception
Server exception during query processing.
Can be continuous list of exceptions until nested is false.
Progress
Progress of query execution periodically reported by server.
Progress reported in deltas. For totals, accumulate it on client.
Pong
Response for client ping, no packet body.
End of stream
No more Data packets will be sent, query result is fully steamed from server to client.
No packet body.
Profile info
Log
Data block with server log.
Encoded as data block of columns, but is never compressed.
Profile events
Data block with profile events.
Encoded as data block of columns, but is never compressed.The value type is UInt64 or Int64, depending on server revision.
