Class: Mohair::Function

Inherits:
Object
  • Object
show all
Defined in:
lib/mohair/sql/tree.rb

Instance Method Summary collapse

Constructor Details

#initialize(item) ⇒ Function

Returns a new instance of Function.



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# File 'lib/mohair/sql/tree.rb', line 37

def initialize item
  @name = item[:function].to_s
  @argv = []
  if item[:arguments] == Array then
    item[:arguments].each do |i|
      @argv << i[:item].to_s
    end
  else
    @argv << item[:arguments][:item]
  end
end

Instance Method Details

#is_agg? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/mohair/sql/tree.rb', line 81

def is_agg?
  true
end

#to_map_js ⇒ Object 



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# File 'lib/mohair/sql/tree.rb', line 49

def to_map_js
  s = @argv[0]
  case @name
  when 'sum' then
    "ret.sum_#{s} = obj.#{s};"
  when 'avg' then
    "ret.sum_#{s} = obj.#{s};\n ret.count_#{s} = 1;"
  when 'count' then
    if s == 'key' then
      "if(!!(v.#{s})){ ret.count_#{s} = 1; }"
    else
      "if(!!(obj.#{s})){ ret.count_#{s} = 1; }"
    end
  end
end

#to_reduce_js ⇒ Object 



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# File 'lib/mohair/sql/tree.rb', line 65

def to_reduce_js

  s = @argv[0]
  case @name
  when 'sum' then
    ["ret.sum_#{s} = 0;", "if(!!(v.sum_#{s})){ ret.sum_#{s} += v.sum_#{s}; }"]
  when 'avg' then
    ["ret.sum_#{s} = 0; ret.count_#{s} = 0;",
     "if(!!(v.sum_#{s})){ ret.sum_#{s} += v.sum_#{s};\n ret.count_#{s} += v.count_#{s}; }"]
  when 'count' then
    ["ret.count_#{s} = 0;",
     "if(!!(v.count_#{s})){ ret.count_#{s} += v.count_#{s}; }"]
  end

end