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Re: patch: SQL/MED(FDW) DDL

From: SAKAMOTO Masahiko <sakamoto(dot)masahiko(at)oss(dot)ntt(dot)co(dot)jp>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Itagaki Takahiro <itagaki(dot)takahiro(at)gmail(dot)com>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: patch: SQL/MED(FDW) DDL
Date: 2010-09-27 06:50:34
Message-ID: 4CA03EBA.4010203@oss.ntt.co.jp (view raw or flat)
Thread:
Lists: pgsql-hackers
sorry for my slow response.

(2010/09/24 21:13), Robert Haas wrote:
> This is a good point.  On the one hand, I do agree that the API for
> simple things like processing CSV files shouldn't be overly complex.
> So perhaps we could start with a simple API and extend it later.  On
> the other hand, understanding how some of the more complex cases ought
> to work provides insight into handling the simpler cases.  So I think
> we should aim to have at least a sketch of a design for the whole
> feature, and then if in phase 1 we want to implement only the easier
> parts, that's OK.

Right. In any case, I should clearify what this API could cover
by this patch and what could not.
# And also how far I and my collaborator can implement..

As Itagaki points out, we have two types of FDW implementations in
progress: flat file wrapper and postgresql wrapper. these items are
described in wiki:
  http://wiki.postgresql.org/wiki/SQL/MED

But it may be hard to get what this fdw routines 'could' provide,
so I and my collaborator is now summarizing these items to discuss and
ask for help. Anyway I think these items are needed to discuss further.
  - API design that is used in executor for a single external table.
  - simple FDW implements to clearfy what this API could provide.

These items will be shown by my collaborator soon.
thanks in advance,

SAKAMOTO Masahiko
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
e-mail: sakamoto(dot)masahiko(at)oss(dot)ntt(dot)co(dot)jp

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