FeeRateCollector::statistics should skip first cellbase value

Signed-off-by: Eval EXEC <execvy@gmail.com>

rpc/src/util/fee_rate.rs

@@ -83,15 +83,19 @@ where
  target = std::cmp::min(self.provider.max_target(), target);
 
  let mut fee_rates = self.provider.collect(target, |mut fee_rates, block_ext| {
- if !block_ext.txs_fees.is_empty()
+ if block_ext.txs_fees.len() > 1
  && block_ext.cycles.is_some()
  && block_ext.txs_sizes.is_some()
  {
+ // block_ext.txs_fees, cycles, txs_sizes length is same
  for (fee, cycles, size) in itertools::izip!(
  block_ext.txs_fees,
  block_ext.cycles.expect("checked"),
  block_ext.txs_sizes.expect("checked")
- ) {
+ )
+ // skip cellbase (first element in the Vec)
+ .skip(1)
+ {
  let weight = get_transaction_weight(size as usize, cycles);
  if weight > 0 {
  fee_rates.push(FeeRate::calculate(fee, weight).as_u64());