Each operation in a demand-driven pipeline can be implemented as an ____ that provides the following functions: open(), next(), and close().(a) Demand(b) Pipeline(c) Iterator(d) All of the mentionedI have been asked this question in an international level competition.This intriguing question originated from Evaluation of Expressions topic in portion Query Processing Techniques of Database Management

Each operation in a demand-driven pipeline can be implemented as an __

1.	Each operation in a demand-driven pipeline can be implemented as an ____ that provides the following functions: open(), next(), and close().(a) Demand(b) Pipeline(c) Iterator(d) All of the mentionedI have been asked this question in an international level competition.This intriguing question originated from Evaluation of Expressions topic in portion Query Processing Techniques of Database Management
Answer» Correct answer is (c) Iterator The BEST EXPLANATION: After a call to OPEN(), each call to next() RETURNS the next output tuple of the operation.

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