introduce stream concept

zhouqingqing / qpmodel

A Relational Optimizer and Executor

MIT License

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introduce stream concept #280

Closed zhouqingqing closed 3 years ago

zhouqingqing commented 3 years ago

Conceptually stream is an infinite table, so it is modeled after BaseTableRef, LogicScanTable and PhysicScanTable to share many properties with above.