Am 31.05.2010 17:44, schrieb Tom Lane:
Richard Broersma<richard.broersma@xxxxxxxxx> writes:
On Mon, May 31, 2010 at 7:48 AM, Jan Strube<js@xxxxxxxxx> wrote:
I accidentally encountered a feature in Postgres 8.3 that I couldn't find in
the documentation while submitting a query like
SELECT my_table.varchar FROM my_table
which returns a concatenated string of all field values per row.
I wonder where this is documented (and if it has something to do with
composite types).
Can anyone please explain?
I don't really know, but the result looks more like a single field
It's equivalent to (my_table.*)::varchar. We've seen enough people
confused by this (or the equivalent cases with text and name as
the target type) that I wonder if we should intentionally break the
symmetry and disable treating this case as a cast. Although I do
rather wonder what the OP expected to happen here.
I didn't expect anything special, because my original statement was
actually a typo. So I was just amazed that I didn't get an error.
Thanks for the explanation,
Jan
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