lib/arel/engines/sql/core_extensions/nil_class.rb


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module Arel
  module Sql
    module NilClassExtensions
      def equality_predicate_sql
        'IS'
      end
      
      def inequality_predicate_sql
        'IS NOT'
      end

      def not_predicate_sql
        'IS NOT'
      end

      NilClass.send(:include, self)
    end
  end
end