Class: Bmg::Operator::Autosummarize

Inherits:
Object
  • Object
show all
Includes:
Unary
Defined in:
lib/bmg/operator/autosummarize.rb

Overview

Autosummarize operator.

Autosummarize helps structuring the results of a big flat join.

This operator is still largely experimental and should be used with care…

Defined Under Namespace

Classes: DistinctList, Same, YByX, YsByX

Instance Attribute Summary

Attributes included from Bmg::Operator

#type

Instance Method Summary collapse

Methods included from Unary

#bind

Methods included from Bmg::Operator

#inspect, #to_s

Methods included from Relation

#bind, #debug, #delete, empty, #empty?, #insert, new, #one, #one_or_nil, #to_csv, #to_json, #update, #visit, #with_typecheck, #without_typecheck, #y_by_x, #ys_by_x

Methods included from Algebra

#allbut, #autosummarize, #autowrap, #constants, #extend, #group, #image, #join, #left_join, #matching, #materialize, #not_matching, #page, #project, #rename, #restrict, #spied, #summarize, #transform, #union, #unspied

Methods included from Algebra::Shortcuts

#image, #join, #left_join, #matching, #not_matching, #prefix, #rxmatch, #suffix

Constructor Details

#initialize(type, operand, by, sums) ⇒ Autosummarize

Returns a new instance of Autosummarize.



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# File 'lib/bmg/operator/autosummarize.rb', line 14

def initialize(type, operand, by, sums)
  @type = type
  @operand = operand
  @by = by
  @sums = sums.each_with_object({}){|(k,v),h| h[k] = to_summarizer(v) }
end

Instance Method Details

#each(&bl) ⇒ Object 



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# File 'lib/bmg/operator/autosummarize.rb', line 27

def each(&bl)
  h = {}
  @operand.each do |tuple|
    key = key(tuple)
    h[key] ||= init(key, tuple)
    h[key] = sum(h[key], tuple)
  end
  h.each_pair do |k,v|
    h[k] = term(v)
  end
  h.values.each(&bl)
end

#to_ast ⇒ Object 



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# File 'lib/bmg/operator/autosummarize.rb', line 40

def to_ast
  [:autosummarize, operand.to_ast, by.dup, sums.dup]
end