Fixed #12079: Changed has_results to get a single result, thus preventing exists() from always returning True on backends that support chunked reads.
Fixed #12079: Changed has_results to get a single result, thus preventing exists() from always returning True on backends that support chunked reads.


git-svn-id: 4f9f921b081c523744c7bf24d959a0db39629563@11654 bcc190cf-cafb-0310-a4f2-bffc1f526a37

FlaPer87/django-nonrel,aparo/django-nonrel,FlaPer87/django-nonrel,aparo/django-nonrel,aparo/django-nonrel,FlaPer87/django-nonrel