Interface Projection
public interface Projection
A projection is a view of some underlying relation, where each tuple is potentially transformed. This interface might also be the one that allows aggregation and un-nesting - not sure yet
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Field Summary
Modifier and TypeFieldDescriptionstatic final Projection
The identity projection is like no projection - just returns self -
Method Summary
Modifier and TypeMethodDescriptiongetProjectionFunction
(Struct sourceType) default ResultOrProblems<Struct>
projectType
(Struct source)
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Field Details
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IDENTITY
The identity projection is like no projection - just returns self
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Method Details
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getProjectionFunction
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projectType
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