On Aug 11, 2010, at 7:41 AM, Tom Lane wrote:
> I had forgotten that discussion. It looks like we trailed off without
> any real consensus: there was about equal sentiment for an array with
> zero elements and an array with one empty-string element. We ended
> up leaving it alone because (a) that wouldn't break anything and (b)
> you could use COALESCE() to substitute whichever behavior your
> application needed for the case.
>
> So maybe we need to revisit the issue. Pavel was claiming that
> switching to a zero-element array result was a no-brainer, but evidently
> it isn't so. Is anybody still excited about the alternatives?
% perl -E 'say q{"}, join(",", ""), q{"}'
""
% ruby -e 'puts %q{"} + [""].join(",") + %q{"}'
""
% python -c 'print "\"" + ",".join([""]) + "\""'
""
I believe those are all "", rather than '"' + undef + '"'.
Best,
David