Each operation in a demand-driven pipeline can be implemented as an ____ that provides the following functions: open(), next(), and close().

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 mentioned

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This intriguing question originated from Evaluation of Expressions topic in portion Query Processing Techniques of Database Management

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Each operation in a demand-driven pipeline can be implemented as an ____ that provides the following functions: open(), next(), and close().

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