newAWSChunkSource(ctx context.Context, ddb *ddbTableStore, s3 *s3ObjectReader, al awsLimits, name addr, chunkCount uint32, q MemoryQuotaProvider, stats *Stats)
: (cs chunkSource, err error)
loadTableIndex(stats *Stats, chunkCount uint32, q MemoryQuotaProvider, loadIndexBytes func(p []byte) error)
: (tableIndex, error)