Processing

Turning a question or a job into work on real machines — batch and streaming.

1. 1Query ProcessingWhy can one question be answered by plans whose costs differ by a factor of ten thousand, and what does each operator force the engine to do?
2. 2Query Planning & OptimizationHow does a system choose a plan for a question when the facts that decide the best plan are unknown until the plan has run?
3. 3Execution Engine RuntimeOnce a query plan is chosen, why does the machine still sit idle, and what does each mechanism of a query runtime pay to buy that idle time back?
4. 4Memory & Resource ManagementWho is allowed to hold how much memory, for how long, and what happens to the work when the answer is less than it asked for?
5. 5StreamingWhat does it cost to remember, when the input never ends?

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