Question: Does GraphQL necessarily needed?

[aeharvlee]

I've seen below comments and have a question here.
https://github.com/coinbase/rosetta-ethereum/blob/23561f903bc93d4fa97bebc1fbbe4c7e5b374e5e/ethereum/client.go#L1404-L1410

Actually we can get the balance atomically using ONLY RPC call.
As you can see https://eth.wiki/json-rpc/API#eth_getbalance, eth_getBalance accept second parameter as block number.

If we need to query using block hash,

• get block by hash and extract block number
• and use eth_getBalance using block number

The benefit of graphQL here is "it can replace the possible multiple RPC calls to one graphQL call".
So in my opinion, we don't have to use graphQL necessarily (the comment includes "MUST" keyword).

I just wondered MUST keyword at that comment.