Autocomplete for user defined variables

I have a feature suggestion.

Currently autocomplete doesn't work for user defined variables.

eg.
set @CALIFORNIA = 7, @WASHINGTON = 9;

SELECT * FROM TABLE_STATES WHERE NAME = @CAL

# at this point if i press CTRL+SPACE the '@CAL' is
# NOT completed to '@CALIFORNIA

It would be great if autocomplete on the user defined variables

You need to type "@@session." or "@@global.", so the auto-completer knows what you want.