# File lib/dm-core/migrations.rb, line 1099
        def type_map
          length    = Property::DEFAULT_LENGTH
          precision = Property::DEFAULT_PRECISION
          scale     = Property::DEFAULT_SCALE_BIGDECIMAL

          @type_map ||= {
            Integer       => { :primitive => 'NUMBER',   :precision => precision, :scale => 0   },
            String        => { :primitive => 'VARCHAR2', :length => length                      },
            Class         => { :primitive => 'VARCHAR2', :length => length                      },
            BigDecimal    => { :primitive => 'NUMBER',   :precision => precision, :scale => nil },
            Float         => { :primitive => 'BINARY_FLOAT',                                    },
            DateTime      => { :primitive => 'DATE'                                             },
            Date          => { :primitive => 'DATE'                                             },
            Time          => { :primitive => 'DATE'                                             },
            TrueClass     => { :primitive => 'NUMBER',  :precision => 1, :scale => 0            },
            Types::Object => { :primitive => 'CLOB'                                             },
            Types::Text   => { :primitive => 'CLOB'                                             },
          }.freeze
        end