Class: Piglet::Field::UdfExpression

Inherits:
Object
  • Object
show all
Includes:
Field
Defined in:
lib/piglet/field/udf_expression.rb

Constant Summary

Constants included from Field

Field::FUNCTIONS, Field::SYMBOLIC_OPERATORS

Instance Attribute Summary

Attributes included from Field

#name, #predecessors, #type

Instance Method Summary collapse

Methods included from Field

#and, #as, #cast, #diff, #distinct, #empty?, #field, #field_alias, #filter, #flatten, #generate_field_alias, #get, #limit, #matches, #ne, #neg, #not, #not_null?, #null?, #or, #order, #sample

Constructor Details

#initialize(ali4s, *args) ⇒ UdfExpression

Returns a new instance of UdfExpression.



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# File 'lib/piglet/field/udf_expression.rb', line 6

def initialize(ali4s, *args)
  @alias, @args = ali4s, args
  @predecessors = args.select { |arg| arg.respond_to? :field_alias }
end

Instance Method Details

#to_s(inner = false) ⇒ Object 



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# File 'lib/piglet/field/udf_expression.rb', line 11

def to_s(inner=false)
  if inner
    "#{@alias}(#{args_to_inner_s(@args)})"
  else
    "#{@alias}(#{args_to_s(@args)})"
  end
end