Limit parallelism when fetching chunks from DynamoDB#644
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If someone sends a query that requires 260,000 chunks we don't want to hit DynamoDB from 260 goroutines in parallel.
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I think I went too far in #603 - if someone sends a query that requires 260,000 chunks we don't want to hit DynamoDB from 260 goroutines in parallel.
(Ideally there would be a global pool of workers for each table)