2010/2/1 Thom Brown <thombrown(at)gmail(dot)com>:
> I noticed that the regression test results don't include the following case:
> select string_agg(a) from (values(null),(null)) g(a);
> There is one similar where a delimiter is provided.
> Which leads me to ask for clarification, would it be safe to assume that
> string_agg can never itself return null?
if all values are null, then result is null.
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