Re: What is the maximum encoding-conversion growth rate, anyway?

On Mon, May 28, 2007 at 10:23:42PM -0400, Tom Lane wrote:
> Tatsuo Ishii <ishii@postgresql.org> writes:
> > I'm afraid we have to mke it larger, rather than smaller for 8.3. For
> > example 0x82f5 in SHIFT_JIS_2004 (new in 8.3) becomes *pair* of 3
> > bytes UTF_8 (0x00e3818b and 0x00e3829a). See
> > util/mb/Unicode/shift_jis_2004_to_utf8_combined.map for more details.
> 
> > So the worst case is now 6, rather than 3.
> 
> Yipes.

Isn't MAX_CONVERSION_GROWTH a multiplier?  Doesn't 2 bytes becoming
2 * 3 bytes represent a growth of 3, not 6?  Or does that 2-byte
SHIFT_JIS_2004 sequence have a 1-byte sequence in another supported
encoding?  Or am I missing something?

-- 
Michael Fuhr