Re: Combining Aggregates
| От | David Rowley |
|---|---|
| Тема | Re: Combining Aggregates |
| Дата | |
| Msg-id | CAApHDvpbQN4js34VB_jYbwosTEeYbHiL-MerkcjrU-MaEMcTYA@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Combining Aggregates (Tomas Vondra <tomas.vondra@2ndquadrant.com>) |
| Ответы |
Re: Combining Aggregates
|
| Список | pgsql-hackers |
On 21 February 2015 at 07:16, Tomas Vondra <tomas.vondra@2ndquadrant.com> wrote:
2) serialize/deserialize functions
----------------------------------
This thread mentions "parallel queries" as a use case, but that means
passing data between processes, and that requires being able to
serialize and deserialize the aggregate state somehow. For actual data
types that's not overly difficult I guess (we can use in/out functions),
but what about aggretates using 'internal' state? I.e. aggregates
passing pointers that we can't serialize?
This is a good question. I really don't know the answer to it as I've not looked at the Robert's API for passing data between backends yet.
Maybe Robert or Amit can answer this?
Regards
David Rowley
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