Editor
One of the most useful slash commands is \e. This will launch an editor to
edit the current query (or previous query, if the current query is blank).
Here are some examples:
# This will launch the default editor (read from $EDITOR env variable).
# It will put the previous query in the editor's buffer.
> \e
# This will open the default editor with the current query in the buffer.
> SELECT * FROM \e
# This will open an existing file in the editor and the contents of the file
will be populated into the prompt once the file is saved.
> \e <filename>
