2016-09-12 6:36 GMT+02:00 Craig Ringer <cr...@2ndquadrant.com>:

> On 12 September 2016 at 12:28, Craig Ringer <cr...@2ndquadrant.com> wrote:
> >> I'll take a closer read-through shortly.
> > isn't a normal literal, it's an xpath expression evaluated at the same
> > time as the rowexpression.
> Sorry for the spam, but turns out that's not the case as implemented
> here. The docs you referenced say it should be an xpath expression,
> but the implementation here is of a literal value, and examples
> elsewhere on the Internet show a literal value. Unclear if the
> referenced docs are wrong or what and I don't have anything to test
> with.
> Feel free to fix/trim the DEFAULT related changes in above docs patch as
> needed.
> Also, tests/docs should probably cover what happens when PATH matches
> more than one element, i.e. produces a list of more than one match.

It is there for case, when this is allowed. When you change the  target
type to any non XML type, then a error is raised.

I didn't write a negative test cases until the text of messages will be
final (or checked by native speaker).



> --
>  Craig Ringer                   http://www.2ndQuadrant.com/
>  PostgreSQL Development, 24x7 Support, Training & Services

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