Sometimes a VQL query will emit a column name with special characters in its name, such as a dot, space or other special characters.
You can still refer to this column using backticks around the identifier name:
-- This will not work because VQL will interpret the dot as an operator
SELECT Raddr.IP FROM ...
-- This will work because VQL will treat the entire thing as a single identifier
SELECT `Raddr.IP` FROM ...
You can read more about VQL identifiers