> But what I'm wondering is why PostgreSQL doesn't support SJIS.  Was there any 
> technical difficulty?  Is there anything you are worried about if adding SJIS?

Yes, there's a technical difficulty with backend code. In many places
it is assumed that any string is "ASCII compatible", which means no
ASCII character is used as a part of multi byte string. Here is such a
random example from src/backend/util/adt/varlena.c:

        /* Else, it's the traditional escaped style */
        for (bc = 0, tp = inputText; *tp != '\0'; bc++)
                if (tp[0] != '\\')

Sometimes SJIS uses '\' as the second byte of it.

Best regards,
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php

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