[client-v2] Request cancellation#2903
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Summary
This PR implement client API to cancel request by original
queryId.What request cancellation means from client side is ability to interrupt outgoing network request when it is not needed any more. In most cases it is implemented with timeouts on client and server side. However there are cases when request should be cancelled before timeout (new data arrived, for instance).
JDBC in this case has request cancellation by sending
KILL QUERY. This guarantees to interrupt request. JDBC requirescancelmethod by spec because only driver implementation knows how to handle it.Client in this case doesn't require a
cancelmethod because query can be constructed in preferable by user way. Client, however, can provide method to try canceling network request by interrupting IO operation.This PR does implement request cancellation on client level. Implementation is based on the fact that each request correlates to a
queryId. User can specify it. Internally client stores map betweenqueryIdand request object that should be cancelled.Closes #1760
Closes #2802
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