fix: regression that makes fts not work on domain types based on tsvector

test/spec/fixtures/data.sql

@@ -957,15 +957,16 @@ INSERT INTO tsearch_to_tsvector(text_search) VALUES ('C''est un peu amusant de f
 INSERT INTO tsearch_to_tsvector(text_search) VALUES ('Es ist eine Art Spaß, das Unmögliche zu machen');
 
 UPDATE tsearch_to_tsvector SET jsonb_search = jsonb_build_object('text_search', text_search);
-
+UPDATE tsearch_to_tsvector SET text_search_domain = to_tsvector('simple', text_search);
+UPDATE tsearch_to_tsvector SET text_search_rec_domain = to_tsvector('simple', text_search);
 
 TRUNCATE TABLE artists CASCADE;
 INSERT INTO artists
 VALUES (1, 'duster'), (2, 'black country, new road'), (3, 'bjork');
 
 TRUNCATE TABLE albums CASCADE;
-INSERT INTO albums 
+INSERT INTO albums
 VALUES (1, 'stratosphere', 1),
-       (2, 'ants from up above',2), 
+       (2, 'ants from up above',2),
        (3, 'vespertine',3),
        (4, 'contemporary movement', 1);

test/spec/fixtures/schema.sql

@@ -3757,9 +3757,17 @@ create table "Surr_Gen_Default_Upsert" (
   extra text
 );
 
+create domain tsvector_not_null as tsvector
+  constraint "tsvector is required" check (value is not null);
+
+create domain tsvector_not_empty as tsvector_not_null
+  constraint "tsvector is required and not empty" check (value <> '');
+
 create table tsearch_to_tsvector (
   text_search text,
-  jsonb_search jsonb
+  jsonb_search jsonb,
+  text_search_domain tsvector_not_null default '',
+  text_search_rec_domain tsvector_not_empty default '.'
 );
 
 create function test.get_tsearch_to_tsvector() returns setof test.tsearch_to_tsvector AS $$