initdb: Set collversion for standard collation UNICODE

Since the behavior of the UNICODE collation can change with new
ICU/Unicode versions, we need to apply the versioning mechanism to it.
We do this with an UPDATE command in initdb; this is similar to how we
put the collation version into pg_database already.

Reported-by: Daniel Verite <daniel@manitou-mail.org>
Discussion: https://www.postgresql.org/message-id/49417853-7bdd-4b23-a4e9-04c7aff33821@manitou-mail.org

src/bin/initdb/initdb.c

@@ -1695,6 +1695,13 @@ setup_description(FILE *cmdfd)
 static void
 setup_collation(FILE *cmdfd)
 {
+	/*
+	 * Set the collation version for collations defined in pg_collation.dat,
+	 * but not the ones where we know that the collation behavior will never
+	 * change.
+	 */
+	PG_CMD_PUTS("UPDATE pg_collation SET collversion = pg_collation_actual_version(oid) WHERE collname = 'unicode';\n\n");
+
 	/* Import all collations we can find in the operating system */
 	PG_CMD_PUTS("SELECT pg_import_system_collations('pg_catalog');\n\n");
 }

src/include/catalog/catversion.h

@@ -57,6 +57,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	202305041
+#define CATALOG_VERSION_NO	202305121
 
 #endif