case_insensitive_comparison

# File activerecord/lib/active_record/connection_adapters/abstract_adapter.rb, line 609
      def case_insensitive_comparison(attribute, value) # :nodoc:
        column = column_for_attribute(attribute)

        if can_perform_case_insensitive_comparison_for?(column)
          attribute.lower.eq(attribute.relation.lower(value))
        else
          attribute.eq(value)
        end
      end