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Getting Iterators from Indexes and Index Repositories

The logic for getting iterators from indexes accommodates various optimizations including:

• avoiding the management of multiple subiterators if this index has no sub indexes
• for indexes having subiterators:
  • choosing sorted or non-sorted management of subiterators
  • doing a 1-time conversion to a "flat index" for snapshots (supporting sorted, set, and bag)

Organization of Streams over Indexes

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