flutter table column width is not working

Question

Below is my Code

child: Table(
               // defaultColumnWidth: FixedColumnWidth(140.0),
                columnWidths: {
                  0: FlexColumnWidth(1),
                  1: FlexColumnWidth(2),
                  2: FlexColumnWidth(1),
                  3: FlexColumnWidth(2),
                },

default column width is working but not flex column width..