Data-Driven Execution

• Schedule leaves

  (generally parallel or distributed system)
  

• Leaves feed data “up” tree; may need to buffer

• Good for slow sources or parallel/distributed

• Often less efficient than iterator w.r.t. memory and CPU

SelectClient = “Atkins”

JoinPressRel.Symbol = Clients.Symbol

Scan

PressRel

Scan

Clients

JoinSymbol = Northwest.CoSymbol

ProjectCoSymbol

ScanNorthwest

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