class Philtre::EmptyExpression
used when transforming to unaltered or partially altered datasets
Public Instance Methods
empty?()
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sometimes this is returned in place of an empty array
# File lib/philtre/empty_expression.rb, line 6 def empty?; true; end
to_s_append( ds, s )
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# File lib/philtre/empty_expression.rb, line 7 def to_s_append( ds, s ); end