predicates_unreferenced_by

# File activerecord/lib/active_record/relation/where_clause.rb, line 151
        def predicates_unreferenced_by(other)
          referenced_columns = other.referenced_columns

          predicates.reject do |node|
            attr = extract_attribute(node) || begin
              node.left if equality_node?(node) && node.left.is_a?(Arel::Predications)
            end
            next false unless attr

            ref = referenced_columns[attr]
            next false unless ref

            if equality_node?(node) && equality_node?(ref) || node == ref
              true
            else
              ActiveSupport::Deprecation.warn(                Merging (#{node.to_sql}) and (#{ref.to_sql}) no longer maintain                both conditions, and will be replaced by the latter in Rails 6.2.                To migrate to Rails 6.2's behavior, use `relation.merge(other, rewhere: true)`..squish)
              false
            end
          end
        end