Re: BUG #16059: Tab-completion of filenames in COPY commands removes required quotes

I wrote:
> Peter Eisentraut <peter.eisentraut@2ndquadrant.com> writes:
>> I have found a weird behavior with identifier quoting, which is not the 
>> subject of this patch, but it appears to be affected by it.

> I'll think about how to improve this.  Given that we're dequoting
> filenames explicitly anyway, maybe we don't need to tell readline that
> double-quote is a quoting character.  Another idea is that maybe
> we ought to refactor things so that identifier dequoting and requoting
> is handled explicitly, similarly to the way filenames work now.
> That would make the patch a lot bigger though.

On reflection, it seems like the best bet for the moment is to
remove double-quote from the rl_completer_quote_characters string,
which should restore all behavior around double-quoted strings to
what it was before.  (We have to keep single-quote in that string,
though, or quoted file names fail entirely.)

The only impact this has on filename completion is that we're no
longer bright enough to convert a double-quoted filename to
single-quoted for you, which would be a nice-to-have but it's
hardly core functionality.

At some point it'd be good to undo that and upgrade quoted-identifier
processing, but I don't really want to include such changes in this
patch.  I'm about burned out on tab completion for right now.

			regards, tom lane