On 02/21/2011 11:23 AM, Tom Lane wrote:
Andrew Dunstan<and...@dunslane.net> writes:
On 02/19/2011 11:07 PM, Tom Lane wrote:
However, it occurs to me that as long as we're passing the function the
ExplainState, it has what it needs to add arbitrary EXPLAIN result
fields.
If we allow the invention of new explain states we'll never be able to
publish an authoritative schema definition of the data. That's not
necessarily an argument against doing it, just something to be aware of.
Maybe we don't care about having EXPLAIN XML output validated.
I thought one of the principal arguments for outputting XML/etc formats
was exactly that we'd be able to add fields without breaking readers.
If that's not the case, why did we bother?
Well, I thought the motivation was to allow easy construction of parsers
for the data, since creating a parser for those formats is pretty trivial.
Anyway, if we don't care about validation that's fine. I just didn't
want us to make that decision unconsciously.
cheers
andrew
--
Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-hackers
