datasource/ethereum: Add comment about block filter -> call filter
@@ -752,6 +752,9 @@ where
match block_filter.contract_addresses.len() {
0 => (),
_ => {
+ // To determine which blocks include a call to addresses
+ // in the block filter, transform the `block_filter` into
+ // a `call_filter` and run `blocks_with_calls`
let call_filter = EthereumCallFilter::from(block_filter);
block_futs.push(Box::new(eth.blocks_with_calls(
&logger,
