Re: UTF8 national character data type support WIP patch and list of open issues. - Mailing list pgsql-hackers

From: "Peter Eisentraut" <peter_e@gmx.net>
> That assumes that the conversion client encoding -> server encoding ->
> NCHAR encoding is not lossy.

Yes, so Tatsuo san suggested to restrict server encoding <-> NCHAR encoding 
combination to those with lossless conversion.


> I thought one main point of this exercise
> was the avoid these conversions and be able to go straight from client
> encoding into NCHAR.

It's slightly different.  Please see the following excerpt:

http://www.postgresql.org/message-id/B1A7485194DE4FDAB8FA781AFB570079@maumau

"4. I guess some users really want to continue to use ShiftJIS or EUC_JP for
database encoding, and use NCHAR for a limited set of columns to store
international text in Unicode:
- to avoid code conversion between the server and the client for performance
- because ShiftJIS and EUC_JP require less amount of storage (2 bytes for
most Kanji) than UTF-8 (3 bytes)
This use case is described in chapter 6 of "Oracle Database Globalization
Support Guide"."



Regards
MauMau