Hi Robert,
Most people have trouble with the Fusion Tables. Be aware, at the best of times, the Fusion Tables are flaky. Google calls them EXPERIMENTAL. The way the tables work is constantly changing. Last week, Google made a change that locked out AI users for several days...they did a speedy fix once they realized the problem. Also, often, the tables are fussy. Either because of heavy traffic or issues on a users DSL or network, connections are difficult. Wanna' be a believer, visit your table using your PC, not your Android. Modify things and see what happens. Sometimes the changes occur immediately, sometimes it takes many seconds. Advice: use the Fusion table with caution. Nice tool but it isn't ready for prime time yet.
Regarding column change; Without seeing your blocks and table, it is difficult to give you advice. If I had this issue, I would visit the Fusion Table from my PC and see if I could 'change' the rows.
Does that mean modify the contents of the rows? I expect you may have a malformed query statement. Do you know how to use the AI2 Do It debugger? Do a right click on the Join block in the query, then capture the image Ctrl + PrntScrn in Windows ... something else in Mac .... you did not fill out the info requested at the beginning of ur post so I do not know what PC you have. If u have Windows, capture the query blocks and Do It response in a png or jpeg and the guys here will look at it.
Regards,
Steve