Get Exchanges fails with nonsensical error about rippled-historical-database

[shekenahglory]

if you use an interval, the returned result is already individual exchanges reduced and aggregated into each time interval, so in my thinking if you want it reduced further, you should not include the interval, either that or not including interval will give you an aggregation of all individual exchanges into a single aggregate.

Also, result and type query parameters don't do anything here, all exchanges are the result of successful transactions, and there is no further subdivision between exchanges that are the result of Payment transactions vs OfferCreate transactions.