Remove arbitrary (and incorrect) requirement that composite types must have at least two members. Fixes #4451

docs/en_US/release_notes_4_15.rst

@@ -27,6 +27,7 @@ Bug fixes
 | `Issue #4191 <https://redmine.postgresql.org/issues/4191>`_ -  Ensure comments are shown in reverse engineered SQL for table partitions.
 | `Issue #4242 <https://redmine.postgresql.org/issues/4242>`_ -  Handle NULL values appropriately when sorting backgrid tables.
 | `Issue #4341 <https://redmine.postgresql.org/issues/4341>`_ -  Give appropriate error messages when the user tries to use an blank master password.
+| `Issue #4451 <https://redmine.postgresql.org/issues/4451>`_ -  Remove arbitrary (and incorrect) requirement that composite types must have at least two members.
 | `Issue #4459 <https://redmine.postgresql.org/issues/4459>`_ -  Don't quote bigints when copying them from the Query Tool results grid.
 | `Issue #4482 <https://redmine.postgresql.org/issues/4482>`_ -  Ensure compression level is passed to pg_dump when backing up in directory format.
 | `Issue #4483 <https://redmine.postgresql.org/issues/4483>`_ -  Ensure the number of jobs can be specified when backing up in directory format.

web/pgadmin/browser/server_groups/servers/databases/schemas/types/__init__.py

@@ -929,16 +929,6 @@ class TypeView(PGChildNodeView, DataTypeReader):
                     )
                 )
             # Additional checks goes here
-            # If type is composite then check if it has two members
-            if data and data[arg] == 'c':
-                if len(data['composite']) < 2:
-                    return make_json_response(
-                        status=410,
-                        success=0,
-                        errormsg=gettext(
-                            'Composite types require at least two members.'
-                        )
-                    )
             # If type is range then check if subtype is defined or not
             if data and data[arg] == 'r':
                 if 'typname' not in data or data['typname'] is None:
@@ -1285,11 +1275,6 @@ class TypeView(PGChildNodeView, DataTypeReader):
                     return "-- definition incomplete"
 
             # Additional checks go here
-            # If type is composite then check if it has two members
-            if data and data[arg] == 'c':
-                if len(data['composite']) < 2:
-                    return "-- definition incomplete"
-
             # If type is range then check if subtype is defined or not
             if data and data[arg] == 'r':
                 if 'typname' not in data or data['typname'] is None:

web/pgadmin/browser/server_groups/servers/databases/schemas/types/tests/default/create_composite_type_one_field.sql

@@ -0,0 +1,11 @@
+-- Type: composite_type_$%{}[]()&*^!@"'`\/#
+
+-- DROP TYPE public."composite_type_$%{}[]()&*^!@""'`\/#";
+
+CREATE TYPE public."composite_type_$%{}[]()&*^!@""'`\/#" AS
+(
+	mname1 bigint
+);
+
+ALTER TYPE public."composite_type_$%{}[]()&*^!@""'`\/#"
+    OWNER TO <OWNER>;

web/pgadmin/browser/server_groups/servers/databases/schemas/types/tests/default/tests.json

@@ -108,6 +108,32 @@
       "data": {}
     },
 
+    {
+      "type": "create",
+      "name": "Create Composite type - one field",
+      "endpoint": "NODE-type.obj",
+      "sql_endpoint": "NODE-type.sql_id",
+      "data": {
+        "name": "composite_type_$%{}[]()&*^!@\"'`\\/#",
+        "is_sys_type":false,
+        "typtype":"c",
+        "schema":"public",
+        "composite":[
+            {"member_name":"mname1","type":"bigint","is_tlength":false,"is_precision":false}
+        ],
+        "typacl":[],
+        "seclabels":[],
+        "description":""
+      },
+      "expected_sql_file": "create_composite_type_one_field.sql"
+    },
+    {
+      "type": "delete",
+      "name": "Drop Composite type - one field",
+      "endpoint": "NODE-type.obj_id",
+      "sql_endpoint": "NODE-type.sql_id",
+      "data": {}
+    },
 
     {
       "type": "create",