Changelog: Test unicode escapes

Unicode escapes work as expected, related tests are added.

Changelog entry on PG13:
Allow Unicode escapes, e.g., E'\u####', U&'\####', to specify any character available in the database encoding, even when the database encoding is not UTF-8 (Tom Lane)

src/test/regress/expected/pg13.out

@@ -83,6 +83,7 @@ SELECT * FROM ab WHERE (ROW(a,b)).f2 > (ROW(0,38)).f2 ORDER BY 1,2;
  20 | 40
 (1 row)
 
+-- test normalized
 CREATE TABLE text_table (name text);
 SELECT create_distributed_table('text_table', 'name');
  create_distributed_table
@@ -130,38 +131,6 @@ SELECT * FROM text_table ORDER BY 1;
  слон
 (5 rows)
 
--- Test that we don't propagate base types
-CREATE TYPE myvarchar;
-CREATE FUNCTION myvarcharin(cstring, oid, integer) RETURNS myvarchar
-LANGUAGE internal IMMUTABLE PARALLEL SAFE STRICT AS 'varcharin';
-NOTICE:  return type myvarchar is only a shell
-CREATE FUNCTION myvarcharout(myvarchar) RETURNS cstring
-LANGUAGE internal IMMUTABLE PARALLEL SAFE STRICT AS 'varcharout';
-NOTICE:  argument type myvarchar is only a shell
-CREATE TYPE myvarchar (
-    input = myvarcharin,
-    output = myvarcharout,
-    alignment = integer,
-    storage = main
-);
-CREATE TABLE my_table (a int, b myvarchar);
--- this will error because it seems that we don't propagate the "BASE TYPES"
--- Alter table also errors out so this doesn't seem to apply to use:
--- """Add ALTER TYPE options useful for extensions,
--- like TOAST and I/O functions control (Tomas Vondra, Tom Lane)"""
-SELECT create_distributed_table('my_table', 'a');
-ERROR:  type "test_pg13.myvarchar" does not exist
-CONTEXT:  while executing command on localhost:xxxxx
-CREATE TABLE test_table(a int, b tsvector);
-SELECT create_distributed_table('test_table', 'a');
- create_distributed_table
----------------------------------------------------------------------
-
-(1 row)
-
--- we currently don't support this
-CREATE INDEX test_table_index ON test_table USING gist (b tsvector_ops(siglen = 100));
-ERROR:  citus currently doesn't support this index arguments
 drop schema test_pg13 cascade;
 NOTICE:  drop cascades to 5 other objects
 DETAIL:  drop cascades to table dist_table

src/test/regress/sql/pg13.sql

@@ -43,6 +43,7 @@ INSERT INTO ab SELECT i, 2 * i FROM generate_series(1,20)i;
 SELECT * FROM ab WHERE (ROW(a,b)).f1 > (ROW(10,30)).f1 ORDER BY 1,2;
 SELECT * FROM ab WHERE (ROW(a,b)).f2 > (ROW(0,38)).f2 ORDER BY 1,2;
 
+-- test normalized
 CREATE TABLE text_table (name text);
 SELECT create_distributed_table('text_table', 'name');
 INSERT INTO text_table VALUES ('abc');
@@ -53,4 +54,11 @@ SELECT is_normalized(name) FROM text_table ORDER BY 1;
 SELECT normalize(name) FROM text_table ORDER BY 1;
 INSERT INTO text_table VALUES (normalize(U&'\0061\0308bc', NFC));
 
+-- test unicode escape
+-- insert the word 'data' with unicode escapes
+INSERT INTO text_table VALUES(U&'d\0061t\+000061');
+-- insert the word слон
+INSERT INTO text_table VALUES(U&'\0441\043B\043E\043D');
+SELECT * FROM text_table ORDER BY 1;
+
 drop schema test_pg13 cascade;