User will type in a statement like the following into the Editor:
select mydate from mytable;
He'll then realize he needs just the year value in mydate, so he'll move his cursor and start typing year function:
select year(mydate from mytable;
As soon as he types open parenthesis, the entire Code Completion pops up with all his table columns. None of the things in the list is useful to him as mydate is already entered.
If Code Completion was really smart, it would know that mydate is a date, and then automatically put the closing parenthesis after mydate) and continue on. Otherwise, there needs to be a faster way for him to move the cursor to the end of mydate. Currently he has to click away to get out of Code Completion and click back using the mouse. Pressing ESC works, he would have to arrow key over to after mydate.