Class: Factbase::IndexedUnique

Inherits:
Object
  • Object
show all
Defined in:
lib/factbase/indexed/indexed_unique.rb

Overview

TODO:

#249:30min Improve prediction for ‘unique’ term. Current prediction is quite naive and returns many false positives because it just filters facts which have exactly the same set of keys regardless the values. We should introduce more smart prediction.

Indexed term ‘unique’.

Instance Method Summary collapse

Constructor Details

#initialize(term, idx) ⇒ IndexedUnique

Returns a new instance of IndexedUnique.



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# File 'lib/factbase/indexed/indexed_unique.rb', line 11

def initialize(term, idx)
  @term = term
  @idx = idx
end

Instance Method Details

#predict(maps, _fb, _params) ⇒ Object 



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# File 'lib/factbase/indexed/indexed_unique.rb', line 16

def predict(maps, _fb, _params)
  return nil if @idx.nil?
  key = [maps.object_id, @term.operands.first, @term.op]
  entry = @idx[key]
  maps_array = maps.to_a
  if entry.nil?
    entry = { facts: [], indexed_count: 0 }
    @idx[key] = entry
  end
  if entry[:indexed_count] < maps_array.size
    props = @term.operands.map(&:to_s)
    maps_array[entry[:indexed_count]..].each do |m|
      entry[:facts] << m if props.all? { |p| !m[p].nil? }
    end
    entry[:indexed_count] = maps_array.size
  end
  (maps & []) | entry[:facts]
end