Re: [HACKERS] How can I find a specific collation in pg_collation when using ICU? - Mailing list pgsql-hackers

Peter Geoghegan <pg@bowt.ie> writes:
> On Wed, Aug 9, 2017 at 6:19 PM, Tsunakawa, Takayuki
> <tsunakawa.takay@jp.fujitsu.com> wrote:
>> That's sad news, as I expected ICU to bring its various collation features to PostgreSQL.  I hope it will be easy to
addthem. 

> The reason it is not easy is that text equality is based on strict
> binary equality.

Yeah.  You can change sort order all you want, but you can't easily
change the system's notion of equality.  But when people ask for "case
insensitive" collation, they generally want that too.
        regards, tom lane