Ivy interferes with `sql-connect` command

[glucas]

At some point a change in ivy introduced a problem when trying to use the sql-connect command. The problem has been reported on Emacs StackExchange: the completion cannot find a match regardless of the available set of connections and the input text.

This was working fine in the past, but I don't recall when I first saw the problem appear.

Think I can boil the test case down to this:

(completing-read "Connection: " '("test") nil t nil nil '(nil) nil)

When I have ivy-mode on, this call won't let me complete 'test'. If I turn off ivy-mode, completion of 'test' works. It seems like the issue may be the DEF argument -- replacing that with nil works.

[abo-abo]

Thanks.