presto-client/src/main/java/io/prestosql/client/StatementClientV1.java/StatementClientV1/cancelLeafStage
class StatementClientV1:    @Override
    public void cancelLeafStage()
    {
        checkState(!isClientAborted(), "client is closed");

        URI uri = currentStatusInfo().getPartialCancelUri();
        if (uri != null) {
            httpDelete(uri);
        }
    }