# File lib/active_record/connection_adapters/nulldb_adapter.rb, line 108
  def columns(table_name, name = nil)
    if @tables.size <= 1
      ActiveRecord::Migration.verbose = false
      Kernel.load(File.join(RAILS_ROOT, @schema_path))
    end
    table = @tables[table_name]
    table.columns.map do |col_def|
      ActiveRecord::ConnectionAdapters::Column.new(col_def.name.to_s,
                                                    col_def.default,
                                                    col_def.type,
                                                    col_def.null)
    end
  end