defined_for?

# File activerecord/lib/active_record/connection_adapters/abstract/schema_definitions.rb, line 55
      def defined_for?(columns = nil, name: nil, unique: nil, valid: nil, include: nil, nulls_not_distinct: nil, **options)
        columns = options[:column] if columns.blank?
        (columns.nil? || Array(self.columns) == Array(columns).map(&:to_s)) &&
          (name.nil? || self.name == name.to_s) &&
          (unique.nil? || self.unique == unique) &&
          (valid.nil? || self.valid == valid) &&
          (include.nil? || Array(self.include) == Array(include).map(&:to_s)) &&
          (nulls_not_distinct.nil? || self.nulls_not_distinct == nulls_not_distinct)
      end