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

Field Summary

Fields

Modifier and Type

Field

Description

static final Projection

IDENTITY

The identity projection is like no projection - just returns self
Method Summary

Modifier and Type

Method

Description

ResultOrProblems<Projector>

getProjectionFunction(Struct sourceType)

default ResultOrProblems<Struct>

projectType(Struct source)

Field Details
- IDENTITY
  
  static final Projection IDENTITY
  
  The identity projection is like no projection - just returns self
Method Details
- getProjectionFunction
  
  ResultOrProblems<Projector> getProjectionFunction(Struct sourceType)
- projectType
  
  default ResultOrProblems<Struct> projectType(Struct source)

Interface Projection

Field Summary

Method Summary

Field Details

IDENTITY

Method Details

getProjectionFunction

projectType