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Selection Constructors

 17th September 2015 at 7:37pm

The output of a Filter Step depends on its operator:

  • Most operators derive their output from their input. For example, many of them output a subset of their input, and thus truly live up to the name of "filters", narrowing down the overall output of the containing run. These operators are called selection modifiers.
  • A few operators ignore their input and generate an independent output instead. These are called selection constructors: they construct an entirely new selection.

A good example of a constructor is title. The output of [title[A]title[B]] is just B. But the field operator is a modifier, so [title[A]field:title[B] outputs nothing at all.