Putting them all together

• The iterator model. Each operation is implemented by 3 functions:

  • Open: sets up the data structures and performs initializations
  • GetNext: returns the the next tuple of the result.
  • Close: ends the operations. Cleans up the data structures.

• Enables pipelining!

• Contrast with data-driven materialize model.

• Sometimes it’s the same (e.g., sorted scan).

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