Re: Ragged CSV import
От | Hannu Krosing |
---|---|
Тема | Re: Ragged CSV import |
Дата | |
Msg-id | 1252606823.3931.4.camel@hvost1700 обсуждение исходный текст |
Ответ на | Re: Ragged CSV import (Tom Lane <tgl@sss.pgh.pa.us>) |
Ответы |
Re: Ragged CSV import
|
Список | pgsql-hackers |
On Thu, 2009-09-10 at 10:09 -0400, Tom Lane wrote: > Robert Haas <robertmhaas@gmail.com> writes: > > I am fuzzy on the implementation details for making COPY act as a data > > source for INSERT/SELECT though. I had thought to make EXPLAIN a data > > source, but it turned out not to be possible (as far as I could tell) > > without making EXPLAIN a fully-reserved word, which you vetoed. It > > seems likely that COPY will present similar issues, though I haven't > > tried. > > IIRC the previous discussion touched on making it look like a > set-returning function, although this would be a shade less convenient > for option parsing etc. > > > I am also wondering what happens when someone embeds multiple COPY > > statements in a single query As long as they COPY from different input files it should be perfectly OK. Though this already goes out into SQL/MED land. > , or sticks one inside of a CTE or on the > > inner side of a left join. > > Yeah, it would need to be restricted somehow. A straight SRF function > would materialize its result, but I doubt we want that to happen for > COPY. Making SRF-s streamable is another thing that would make postgreSQL a lot more powerful for all kinds of computing. > (This brings up the whole question of performance impact, which would > have to be thought about and minimized.) Completely agree - nobody wants a slow COPY command. > regards, tom lane -- Hannu Krosing http://www.2ndQuadrant.com PostgreSQL Scalability and Availability Services, Consulting and Training
В списке pgsql-hackers по дате отправления: