columns

# File activerecord/lib/active_record/connection_adapters/postgresql/schema_statements.rb, line 172
        def columns(table_name)
          # Limit, precision, and scale are all handled by the superclass.
          column_definitions(table_name).map do |column_name, type, default, notnull, oid, fmod|
            oid = OID::TYPE_MAP.fetch(oid.to_i, fmod.to_i) {
              OID::Identity.new
            }
            PostgreSQLColumn.new(column_name, default, oid, type, notnull == 'f')
          end
        end