If i change format number on Sql i need to update table?

My application is on the market with alot of users. and i am a little bit afraid to update the app because i do some changing in the columns of my table. I.e i had "number INTEGER," and i only change the format to "number REAL,". i know that if i added new columns or remove columns i need to increase the version of the database and onUpgrade it (i did it before). for my case - i have to onUpgrade the table? or it sould working fine without to do that? When i tried to install to new table after i changing on my own device it's not crash and it's seems like it working very well, but what if the author user get error and all them data delete?