Re: ICU for global collation

In pg14:
|postgres=# create database a LC_COLLATE C LC_CTYPE C LOCALE C;
|ERROR: conflicting or redundant options
|DETAIL: LOCALE cannot be specified together with LC_COLLATE or LC_CTYPE.

In pg15:
|postgres=# create database a LC_COLLATE "en_US.UTF-8" LC_CTYPE "en_US.UTF-8" LOCALE "en_US.UTF-8" ;
|CREATE DATABASE

f2553d430 actually relaxed the restriction by removing this check:

- if (dlocale && (dcollate || dctype))
- ereport(ERROR,
- (errcode(ERRCODE_SYNTAX_ERROR),
- errmsg("conflicting or redundant options"),
- errdetail("LOCALE cannot be specified together with LC_COLLATE or LC_CTYPE.")));

But isn't the right fix to do the corresponding thing in createdb
(relaxing the frontend restriction rather than reverting its relaxation
in the backend).

diff --git a/src/bin/scripts/createdb.c b/src/bin/scripts/createdb.c
index e523e58b218..5b80e56dfd9 100644
--- a/src/bin/scripts/createdb.c
+++ b/src/bin/scripts/createdb.c
@@ -159,15 +159,10 @@ main(int argc, char *argv[])
exit(1);
}

- if (locale)
- {
- if (lc_ctype)
- pg_fatal("only one of --locale and --lc-ctype can be specified");
- if (lc_collate)
- pg_fatal("only one of --locale and --lc-collate can be specified");
+ if (locale && !lc_ctype)
lc_ctype = locale;
+ if (locale && !lc_collate)
lc_collate = locale;
- }

if (encoding)
{

BTW it's somewhat crummy that it uses a string comparison, so if you
write "UTF8" without a dash, it says this; it took me a few minutes to
see the difference...

postgres=# create database a LC_COLLATE "en_US.UTF8" LC_CTYPE "en_US.UTF8" LOCALE "en_US.UTF8";
ERROR: new collation (en_US.UTF8) is incompatible with the collation of the template database (en_US.UTF-8)