Enumerators

• Each “get” op has a corresponding “enumerate” op

• Enumerates multiple values

  • One at a time
  • In batches

• Operations on enumerators

  • Next – Get the next value from an enumerator
  • Has-More – Test whether enumerator has more values
  • Fetch – Get a given number of values
  • Prefetch – Caches a given number of values
  • Free – Indicate an enumerator will no longer be used

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