In TDV Web UI, if a user creates a flow that contains a "Column" object/node, then at the bottom of the display, there is a list of columns available in the table being operated along with checkboxes for each column name.
When a user works using a table that has 200 columns and the user needs to select only 50 columns, the user needs to uncheck the 150 checkboxes available. This hampers user productivity, because the user needs to spend some time and effort to exclude columns that are not to be used in the flow.