support CreateDomainStmt for openGauss

src/gausskernel/process/tcop/utility.cpp

@@ -5720,8 +5720,10 @@ void standard_ProcessUtility(Node* parse_tree, const char* query_string, ParamLi
              * ******************************** DOMAIN statements ****
              */
         case T_CreateDomainStmt:
+#ifdef ENABLE_MULTIPLE_NODES
             if (!IsInitdb && !u_sess->attr.attr_common.IsInplaceUpgrade)
                 ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), errmsg("domain is not yet supported.")));
+#endif
             DefineDomain((CreateDomainStmt*)parse_tree);
 #ifdef PGXC
             if (IS_PGXC_COORDINATOR)

src/test/regress/expected/drop_if_exists.out

@@ -58,9 +58,7 @@ ERROR:  type "test_domain_exists" does not exist
 DROP DOMAIN IF EXISTS test_domain_exists;
 NOTICE:  type "test_domain_exists" does not exist, skipping
 CREATE domain test_domain_exists as int not null check (value > 0);
-ERROR:  domain is not yet supported.
 DROP DOMAIN IF EXISTS test_domain_exists;
-NOTICE:  type "test_domain_exists" does not exist, skipping
 DROP DOMAIN test_domain_exists;
 ERROR:  type "test_domain_exists" does not exist
 ---

src/test/regress/expected/generated_col.out

@@ -473,25 +473,15 @@ INSERT INTO gtest23q VALUES (2, 5);  -- error
 ERROR:  insert or update on table "gtest23q" violates foreign key constraint "gtest23q_b_fkey"
 DETAIL:  Key (b)=(5) is not present in table "gtest23p".
 DROP TABLE gtest23q;
--- domains (domain is not yet supported.)
+-- domains
 CREATE DOMAIN gtestdomain1 AS int CHECK (VALUE < 10);
-ERROR:  domain is not yet supported.
 CREATE TABLE gtest24 (a int PRIMARY KEY, b gtestdomain1 GENERATED ALWAYS AS (a * 2) STORED);
-ERROR:  type "gtestdomain1" does not exist
-LINE 1: CREATE TABLE gtest24 (a int PRIMARY KEY, b gtestdomain1 GENE...
-                                                   ^
+NOTICE:  CREATE TABLE / PRIMARY KEY will create implicit index "gtest24_pkey" for table "gtest24"
 INSERT INTO gtest24 (a) VALUES (4);  -- ok
-ERROR:  relation "gtest24" does not exist on datanode1
-LINE 1: INSERT INTO gtest24 (a) VALUES (4);
-                    ^
 INSERT INTO gtest24 (a) VALUES (6);  -- error
-ERROR:  relation "gtest24" does not exist on datanode1
-LINE 1: INSERT INTO gtest24 (a) VALUES (6);
-                    ^
+ERROR:  value for domain gtestdomain1 violates check constraint "gtestdomain1_check"
 DROP TABLE gtest24;
-ERROR:  table "gtest24" does not exist
 DROP DOMAIN gtestdomain1;
-ERROR:  type "gtestdomain1" does not exist
 -- typed tables (currently not supported)
 CREATE TYPE gtest_type AS (f1 integer, f2 text, f3 bigint);
 CREATE TABLE gtest28 OF gtest_type (f1 WITH OPTIONS GENERATED ALWAYS AS (f2 *2) STORED);

src/test/regress/sql/generated_col.sql

@@ -266,7 +266,7 @@ INSERT INTO gtest23q VALUES (2, 5);  -- error
 
 DROP TABLE gtest23q;
 
--- domains (domain is not yet supported.)
+-- domains
 CREATE DOMAIN gtestdomain1 AS int CHECK (VALUE < 10);
 CREATE TABLE gtest24 (a int PRIMARY KEY, b gtestdomain1 GENERATED ALWAYS AS (a * 2) STORED);
 INSERT INTO gtest24 (a) VALUES (4);  -- ok