Streamline dfei test functor usage

Gerhard Ravenrequested to merge
improve-dfei-test into master
  • Remove unneeded VALUE and VALUE_OR functors, and put the actually necessary ones in a more logical place
  • Drop unnecessary CAST_TO_FLOAT: this depends on Rec!4071 (merged), which generalizes the 'SUM' functor so that it can sum integers, and not just floats
  • Prefer COUNT_IF(predicate) over SIZE_OF @ FILTER(predicate)
  • Make creation of FunctorCollection more structured: instead of repeating lots of things, construct them from basic blocks.
  • Take advantage of the more generic FLATTEN in Rec!4071 (merged) to flatten 'earlier', which further simplifies the structure

must go together with Rec!4071 (merged)

Edited by Gerhard Raven

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