There is something odd here going on:

alvherre=# alter group test add user current_user;
ERROR:  role "test" is a member of role "(null)"

Surely (null) is not the right name to be reporting there ...

Attached is a rebased patch, which also has some incomplete doc changes.

With this patch applied, doing
\h ALTER ROLE
in psql looks quite odd: note how wide it has become.  Maybe we should
be doing this differently?  (Hmm, why don't we accept ALL in the first SET
line?  Maybe that's just a mistake and the four lines should be all
identical in the first half ...)


alvherre=# \h alter role
Command:     ALTER ROLE
Description: change a database role
Syntax:
ALTER ROLE { name | CURRENT_USER | SESSION_USER } [ WITH ] option [ ... ]

where option can be:

      SUPERUSER | NOSUPERUSER
    | CREATEDB | NOCREATEDB
    | CREATEROLE | NOCREATEROLE
    | CREATEUSER | NOCREATEUSER
    | INHERIT | NOINHERIT
    | LOGIN | NOLOGIN
    | REPLICATION | NOREPLICATION
    | BYPASSRLS | NOBYPASSRLS
    | CONNECTION LIMIT connlimit
    | [ ENCRYPTED | UNENCRYPTED ] PASSWORD 'password'
    | VALID UNTIL 'timestamp'

ALTER ROLE name RENAME TO new_name

ALTER ROLE { name | CURRENT_USER | SESSION_USER } [ IN DATABASE database_name ] 
SET configuration_parameter { TO | = } { value | DEFAULT }
ALTER ROLE { name | CURRENT_USER | SESSION_USER | ALL } [ IN DATABASE 
database_name ] SET configuration_parameter FROM CURRENT
ALTER ROLE { name | CURRENT_USER | SESSION_USER | ALL } [ IN DATABASE 
database_name ] RESET configuration_parameter
ALTER ROLE { name | CURRENT_USER | SESSION_USER | ALL } [ IN DATABASE 
database_name ] RESET ALL

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
diff --git a/doc/src/sgml/ref/alter_group.sgml b/doc/src/sgml/ref/alter_group.sgml
index 1432242..5f0d8b4 100644
--- a/doc/src/sgml/ref/alter_group.sgml
+++ b/doc/src/sgml/ref/alter_group.sgml
@@ -21,10 +21,10 @@ PostgreSQL documentation
 
  <refsynopsisdiv>
 <synopsis>
-ALTER GROUP <replaceable class="PARAMETER">group_name</replaceable> ADD USER <replaceable class="PARAMETER">user_name</replaceable> [, ... ]
-ALTER GROUP <replaceable class="PARAMETER">group_name</replaceable> DROP USER <replaceable class="PARAMETER">user_name</replaceable> [, ... ]
+ALTER GROUP { <replaceable class="PARAMETER">group_name</replaceable> | CURRENT_USER | SESSION_USER } ADD USER <replaceable class="PARAMETER">user_name</replaceable> [, ... ]
+ALTER GROUP { <replaceable class="PARAMETER">group_name</replaceable> | CURRENT_USER | SESSION_USER } DROP USER <replaceable class="PARAMETER">user_name</replaceable> [, ... ]
 
-ALTER GROUP <replaceable class="PARAMETER">group_name</replaceable> RENAME TO <replaceable>new_name</replaceable>
+ALTER GROUP { <replaceable class="PARAMETER">group_name</replaceable> | CURRENT_USER | SESSION_USER } RENAME TO <replaceable>new_name</replaceable>
 </synopsis>
  </refsynopsisdiv>
 
diff --git a/doc/src/sgml/ref/alter_role.sgml b/doc/src/sgml/ref/alter_role.sgml
index 0471daa..59f6499 100644
--- a/doc/src/sgml/ref/alter_role.sgml
+++ b/doc/src/sgml/ref/alter_role.sgml
@@ -21,7 +21,7 @@ PostgreSQL documentation
 
  <refsynopsisdiv>
 <synopsis>
-ALTER ROLE <replaceable class="PARAMETER">name</replaceable> [ [ WITH ] <replaceable class="PARAMETER">option</replaceable> [ ... ] ]
+ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER } [ WITH ] <replaceable class="PARAMETER">option</replaceable> [ ... ]
 
 <phrase>where <replaceable class="PARAMETER">option</replaceable> can be:</phrase>
 
@@ -39,10 +39,10 @@ ALTER ROLE <replaceable class="PARAMETER">name</replaceable> [ [ WITH ] <replace
 
 ALTER ROLE <replaceable class="PARAMETER">name</replaceable> RENAME TO <replaceable>new_name</replaceable>
 
-ALTER ROLE <replaceable class="PARAMETER">name</replaceable> [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
-ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
-ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] RESET <replaceable>configuration_parameter</replaceable>
-ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] RESET ALL
+ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
+ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
+ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] RESET <replaceable>configuration_parameter</replaceable>
+ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] RESET ALL
 </synopsis>
  </refsynopsisdiv>
 
@@ -129,6 +129,25 @@ ALTER ROLE { <replaceable class="PARAMETER">name</replaceable> | ALL } [ IN DATA
      </varlistentry>
 
      <varlistentry>
+      <term>CURRENT_USER</term>
+      <listitem>
+       <para>
+        Indicates to 
+        Alter the current user instead of a specifically named role.
+       </para>
+      </listitem>
+     </varlistentry>
+
+     <varlistentry>
+      <term>SESSION_USER</term>
+      <listitem>
+       <para>
+        Alter the current session role instead of a specifically named role.
+       </para>
+      </listitem>
+     </varlistentry>
+
+     <varlistentry>
       <term><literal>SUPERUSER</literal></term>
       <term><literal>NOSUPERUSER</literal></term>
       <term><literal>CREATEDB</></term>
diff --git a/doc/src/sgml/ref/alter_user.sgml b/doc/src/sgml/ref/alter_user.sgml
index 58ae1da..628729d 100644
--- a/doc/src/sgml/ref/alter_user.sgml
+++ b/doc/src/sgml/ref/alter_user.sgml
@@ -21,7 +21,7 @@ PostgreSQL documentation
 
  <refsynopsisdiv>
 <synopsis>
-ALTER USER <replaceable class="PARAMETER">name</replaceable> [ [ WITH ] <replaceable class="PARAMETER">option</replaceable> [ ... ] ]
+ALTER USER { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER } [ WITH ] <replaceable class="PARAMETER">option</replaceable> [ ... ]
 
 <phrase>where <replaceable class="PARAMETER">option</replaceable> can be:</phrase>
 
@@ -38,10 +38,10 @@ ALTER USER <replaceable class="PARAMETER">name</replaceable> [ [ WITH ] <replace
 
 ALTER USER <replaceable class="PARAMETER">name</replaceable> RENAME TO <replaceable>new_name</replaceable>
 
-ALTER USER <replaceable class="PARAMETER">name</replaceable> SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
-ALTER USER <replaceable class="PARAMETER">name</replaceable> SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
-ALTER USER <replaceable class="PARAMETER">name</replaceable> RESET <replaceable>configuration_parameter</replaceable>
-ALTER USER <replaceable class="PARAMETER">name</replaceable> RESET ALL
+ALTER USER { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER } SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
+ALTER USER { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER } SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
+ALTER USER { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER } RESET <replaceable>configuration_parameter</replaceable>
+ALTER USER { <replaceable class="PARAMETER">name</replaceable> | CURRENT_USER | SESSION_USER } RESET ALL
 </synopsis>
  </refsynopsisdiv>
 
diff --git a/src/backend/catalog/aclchk.c b/src/backend/catalog/aclchk.c
index 1e3888e..e88c8c3 100644
--- a/src/backend/catalog/aclchk.c
+++ b/src/backend/catalog/aclchk.c
@@ -421,22 +421,25 @@ ExecuteGrantStmt(GrantStmt *stmt)
 	istmt.behavior = stmt->behavior;
 
 	/*
-	 * Convert the PrivGrantee list into an Oid list.  Note that at this point
-	 * we insert an ACL_ID_PUBLIC into the list if an empty role name is
-	 * detected (which is what the grammar uses if PUBLIC is found), so
-	 * downstream there shouldn't be any additional work needed to support
-	 * this case.
+	 * Convert the RoleSpec list into an Oid list.  Note that at this point
+	 * we insert an ACL_ID_PUBLIC into the list if appropriate, so downstream
+	 * there shouldn't be any additional work needed to support this case.
 	 */
 	foreach(cell, stmt->grantees)
 	{
-		PrivGrantee *grantee = (PrivGrantee *) lfirst(cell);
+		RoleSpec *grantee = (RoleSpec *) lfirst(cell);
+		Oid grantee_uid;
 
-		if (grantee->rolname == NULL)
-			istmt.grantees = lappend_oid(istmt.grantees, ACL_ID_PUBLIC);
-		else
-			istmt.grantees =
-				lappend_oid(istmt.grantees,
-							get_role_oid(grantee->rolname, false));
+		switch (grantee->roletype)
+		{
+			case ROLESPEC_PUBLIC:
+				grantee_uid = ACL_ID_PUBLIC;
+				break;
+			default:
+				grantee_uid = get_rolespec_oid((Node *) grantee, false);
+				break;
+		}
+		istmt.grantees = lappend_oid(istmt.grantees, grantee_uid);
 	}
 
 	/*
@@ -904,22 +907,25 @@ ExecAlterDefaultPrivilegesStmt(AlterDefaultPrivilegesStmt *stmt)
 	iacls.behavior = action->behavior;
 
 	/*
-	 * Convert the PrivGrantee list into an Oid list.  Note that at this point
-	 * we insert an ACL_ID_PUBLIC into the list if an empty role name is
-	 * detected (which is what the grammar uses if PUBLIC is found), so
-	 * downstream there shouldn't be any additional work needed to support
-	 * this case.
+	 * Convert the RoleSpec list into an Oid list.  Note that at this point
+	 * we insert an ACL_ID_PUBLIC into the list if appropriate, so downstream
+	 * there shouldn't be any additional work needed to support this case.
 	 */
 	foreach(cell, action->grantees)
 	{
-		PrivGrantee *grantee = (PrivGrantee *) lfirst(cell);
+		RoleSpec *grantee = (RoleSpec *) lfirst(cell);
+		Oid grantee_uid;
 
-		if (grantee->rolname == NULL)
-			iacls.grantees = lappend_oid(iacls.grantees, ACL_ID_PUBLIC);
-		else
-			iacls.grantees =
-				lappend_oid(iacls.grantees,
-							get_role_oid(grantee->rolname, false));
+		switch (grantee->roletype)
+		{
+			case ROLESPEC_PUBLIC:
+				grantee_uid = ACL_ID_PUBLIC;
+				break;
+			default:
+				grantee_uid = get_rolespec_oid((Node *) grantee, false);
+				break;
+		}
+		iacls.grantees = lappend_oid(iacls.grantees, grantee_uid);
 	}
 
 	/*
diff --git a/src/backend/commands/alter.c b/src/backend/commands/alter.c
index 59aacef..af726ca 100644
--- a/src/backend/commands/alter.c
+++ b/src/backend/commands/alter.c
@@ -699,7 +699,7 @@ AlterObjectNamespace_internal(Relation rel, Oid objid, Oid nspOid)
 ObjectAddress
 ExecAlterOwnerStmt(AlterOwnerStmt *stmt)
 {
-	Oid			newowner = get_role_oid(stmt->newowner, false);
+	Oid	newowner = get_rolespec_oid(stmt->newowner, false);
 
 	switch (stmt->objectType)
 	{
diff --git a/src/backend/commands/extension.c b/src/backend/commands/extension.c
index aa73357..5cc74d0 100644
--- a/src/backend/commands/extension.c
+++ b/src/backend/commands/extension.c
@@ -1371,7 +1371,7 @@ CreateExtension(CreateExtensionStmt *stmt)
 			CreateSchemaStmt *csstmt = makeNode(CreateSchemaStmt);
 
 			csstmt->schemaname = schemaName;
-			csstmt->authid = NULL;		/* will be created by current user */
+			csstmt->authrole = NULL;	/* will be created by current user */
 			csstmt->schemaElts = NIL;
 			csstmt->if_not_exists = false;
 			CreateSchemaCommand(csstmt, NULL);
diff --git a/src/backend/commands/foreigncmds.c b/src/backend/commands/foreigncmds.c
index bd48391..3b85c2c 100644
--- a/src/backend/commands/foreigncmds.c
+++ b/src/backend/commands/foreigncmds.c
@@ -198,24 +198,6 @@ transformGenericOptions(Oid catalogId,
 
 
 /*
- * Convert the user mapping user name to OID
- */
-static Oid
-GetUserOidFromMapping(const char *username, bool missing_ok)
-{
-	if (!username)
-		/* PUBLIC user mapping */
-		return InvalidOid;
-
-	if (strcmp(username, "current_user") == 0)
-		/* map to the owner */
-		return GetUserId();
-
-	/* map to provided user */
-	return get_role_oid(username, missing_ok);
-}
-
-/*
  * Internal workhorse for changing a data wrapper's owner.
  *
  * Allow this only for superusers; also the new owner must be a
@@ -1156,10 +1138,14 @@ CreateUserMapping(CreateUserMappingStmt *stmt)
 	ObjectAddress referenced;
 	ForeignServer *srv;
 	ForeignDataWrapper *fdw;
+	RoleSpec   *role = (RoleSpec *) stmt->user;
 
 	rel = heap_open(UserMappingRelationId, RowExclusiveLock);
 
-	useId = GetUserOidFromMapping(stmt->username, false);
+	if (role->roletype == ROLESPEC_PUBLIC)
+		useId = ACL_ID_PUBLIC;
+	else
+		useId = get_rolespec_oid(stmt->user, false);
 
 	/* Check that the server exists. */
 	srv = GetForeignServerByName(stmt->servername, false);
@@ -1252,10 +1238,15 @@ AlterUserMapping(AlterUserMappingStmt *stmt)
 	Oid			umId;
 	ForeignServer *srv;
 	ObjectAddress address;
+	RoleSpec   *role = (RoleSpec *) stmt->user;
 
 	rel = heap_open(UserMappingRelationId, RowExclusiveLock);
 
-	useId = GetUserOidFromMapping(stmt->username, false);
+	if (role->roletype == ROLESPEC_PUBLIC)
+		useId = ACL_ID_PUBLIC;
+	else
+		useId = get_rolespec_oid(stmt->user, false);
+
 	srv = GetForeignServerByName(stmt->servername, false);
 
 	umId = GetSysCacheOid2(USERMAPPINGUSERSERVER,
@@ -1338,20 +1329,27 @@ RemoveUserMapping(DropUserMappingStmt *stmt)
 	Oid			useId;
 	Oid			umId;
 	ForeignServer *srv;
+	RoleSpec   *role = (RoleSpec *) stmt->user;
 
-	useId = GetUserOidFromMapping(stmt->username, stmt->missing_ok);
-	srv = GetForeignServerByName(stmt->servername, true);
-
-	if (stmt->username && !OidIsValid(useId))
+	if (role->roletype == ROLESPEC_PUBLIC)
+		useId = ACL_ID_PUBLIC;
+	else
 	{
-		/*
-		 * IF EXISTS specified, role not found and not public. Notice this and
-		 * leave.
-		 */
-		elog(NOTICE, "role \"%s\" does not exist, skipping", stmt->username);
-		return InvalidOid;
+		useId = get_rolespec_oid(stmt->user, stmt->missing_ok);
+		if (!OidIsValid(useId))
+		{
+			/*
+			 * IF EXISTS specified, role not found and not public. Notice this
+			 * and leave.
+			 */
+			elog(NOTICE, "role \"%s\" does not exist, skipping",
+				 role->rolename);
+			return InvalidOid;
+		}
 	}
 
+	srv = GetForeignServerByName(stmt->servername, true);
+
 	if (!srv)
 	{
 		if (!stmt->missing_ok)
diff --git a/src/backend/commands/policy.c b/src/backend/commands/policy.c
index e862997..a3d840d 100644
--- a/src/backend/commands/policy.c
+++ b/src/backend/commands/policy.c
@@ -129,13 +129,7 @@ parse_policy_command(const char *cmd_name)
 
 /*
  * policy_role_list_to_array
- *   helper function to convert a list of role names in to an array of
- *   role ids.
- *
- * Note: If PUBLIC is provided as a role name, then ACL_ID_PUBLIC is
- *       used as the role id.
- *
- * roles - the list of role names to convert.
+ *   helper function to convert a list of RoleSpecs to an array of role ids.
  */
 static ArrayType *
 policy_role_list_to_array(List *roles)
@@ -162,25 +156,25 @@ policy_role_list_to_array(List *roles)
 
 	foreach(cell, roles)
 	{
-		Oid		roleid = get_role_oid_or_public(strVal(lfirst(cell)));
+		RoleSpec *spec = lfirst(cell);
 
 		/*
 		 * PUBLIC covers all roles, so it only makes sense alone.
 		 */
-		if (roleid == ACL_ID_PUBLIC)
+		if (spec->roletype == ROLESPEC_PUBLIC)
 		{
 			if (num_roles != 1)
 				ereport(WARNING,
 						(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 						 errmsg("ignoring roles specified other than public"),
 						 errhint("All roles are members of the public role.")));
-
-			temp_array[0] = ObjectIdGetDatum(roleid);
+			temp_array[0] = ObjectIdGetDatum(ACL_ID_PUBLIC);
 			num_roles = 1;
 			break;
 		}
 		else
-			temp_array[i++] = ObjectIdGetDatum(roleid);
+			temp_array[i++] =
+				ObjectIdGetDatum(get_rolespec_oid((Node *) spec, false));
 	}
 
 	role_ids = construct_array(temp_array, num_roles, OIDOID, sizeof(Oid), true,
diff --git a/src/backend/commands/schemacmds.c b/src/backend/commands/schemacmds.c
index 722142e..c090ed2 100644
--- a/src/backend/commands/schemacmds.c
+++ b/src/backend/commands/schemacmds.c
@@ -21,6 +21,7 @@
 #include "catalog/dependency.h"
 #include "catalog/indexing.h"
 #include "catalog/namespace.h"
+#include "catalog/pg_authid.h"
 #include "catalog/objectaccess.h"
 #include "catalog/pg_namespace.h"
 #include "commands/dbcommands.h"
@@ -42,8 +43,7 @@ static void AlterSchemaOwner_internal(HeapTuple tup, Relation rel, Oid newOwnerI
 Oid
 CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString)
 {
-	const char *schemaName = stmt->schemaname;
-	const char *authId = stmt->authid;
+	const char	*schemaName = stmt->schemaname;
 	Oid			namespaceId;
 	OverrideSearchPath *overridePath;
 	List	   *parsetree_list;
@@ -58,11 +58,24 @@ CreateSchemaCommand(CreateSchemaStmt *stmt, const char *queryString)
 	/*
 	 * Who is supposed to own the new schema?
 	 */
-	if (authId)
-		owner_uid = get_role_oid(authId, false);
+	if (stmt->authrole)
+		owner_uid = get_rolespec_oid(stmt->authrole, false);
 	else
 		owner_uid = saved_uid;
 
+	/* fill schema name with the user name if not specified */
+	if (!schemaName)
+	{
+		HeapTuple tuple;
+
+		tuple = SearchSysCache1(AUTHOID, ObjectIdGetDatum(owner_uid));
+		if (!HeapTupleIsValid(tuple))
+			elog(ERROR, "cache lookup failed for role %u", owner_uid);
+		schemaName =
+			pstrdup(NameStr(((Form_pg_authid) GETSTRUCT(tuple))->rolname));
+		ReleaseSysCache(tuple);
+	}
+
 	/*
 	 * To create a schema, must have schema-create privilege on the current
 	 * database and must be able to become the target role (this does not
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index 6536778..623e6bf 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -3507,7 +3507,7 @@ ATExecCmd(List **wqueue, AlteredTableInfo *tab, Relation rel,
 			break;
 		case AT_ChangeOwner:	/* ALTER OWNER */
 			ATExecChangeOwner(RelationGetRelid(rel),
-							  get_role_oid(cmd->name, false),
+							  get_rolespec_oid(cmd->newowner, false),
 							  false, lockmode);
 			break;
 		case AT_ClusterOn:		/* CLUSTER ON */
@@ -9388,7 +9388,7 @@ AlterTableMoveAll(AlterTableMoveAllStmt *stmt)
 	HeapTuple	tuple;
 	Oid			orig_tablespaceoid;
 	Oid			new_tablespaceoid;
-	List	   *role_oids = roleNamesToIds(stmt->roles);
+	List	   *role_oids = roleSpecsToIds(stmt->roles);
 
 	/* Ensure we were not asked to move something we can't */
 	if (stmt->objtype != OBJECT_TABLE && stmt->objtype != OBJECT_INDEX &&
diff --git a/src/backend/commands/tablespace.c b/src/backend/commands/tablespace.c
index 68b6917..fd22612 100644
--- a/src/backend/commands/tablespace.c
+++ b/src/backend/commands/tablespace.c
@@ -252,7 +252,7 @@ CreateTableSpace(CreateTableSpaceStmt *stmt)
 
 	/* However, the eventual owner of the tablespace need not be */
 	if (stmt->owner)
-		ownerId = get_role_oid(stmt->owner, false);
+		ownerId = get_rolespec_oid(stmt->owner, false);
 	else
 		ownerId = GetUserId();
 
diff --git a/src/backend/commands/user.c b/src/backend/commands/user.c
index 0d30838..0123abc 100644
--- a/src/backend/commands/user.c
+++ b/src/backend/commands/user.c
@@ -445,10 +445,10 @@ CreateRole(CreateRoleStmt *stmt)
 	 * option, rolemembers don't.
 	 */
 	AddRoleMems(stmt->role, roleid,
-				adminmembers, roleNamesToIds(adminmembers),
+				adminmembers, roleSpecsToIds(adminmembers),
 				GetUserId(), true);
 	AddRoleMems(stmt->role, roleid,
-				rolemembers, roleNamesToIds(rolemembers),
+				rolemembers, roleSpecsToIds(rolemembers),
 				GetUserId(), false);
 
 	/* Post creation hook for new role */
@@ -480,7 +480,9 @@ AlterRole(AlterRoleStmt *stmt)
 	TupleDesc	pg_authid_dsc;
 	HeapTuple	tuple,
 				new_tuple;
+	Form_pg_authid authform;
 	ListCell   *option;
+	char	   *rolename = NULL;
 	char	   *password = NULL;	/* user password */
 	bool		encrypt_password = Password_encryption; /* encrypt password? */
 	char		encrypted_password[MD5_PASSWD_LEN + 1];
@@ -649,33 +651,30 @@ AlterRole(AlterRoleStmt *stmt)
 	pg_authid_rel = heap_open(AuthIdRelationId, RowExclusiveLock);
 	pg_authid_dsc = RelationGetDescr(pg_authid_rel);
 
-	tuple = SearchSysCache1(AUTHNAME, PointerGetDatum(stmt->role));
-	if (!HeapTupleIsValid(tuple))
-		ereport(ERROR,
-				(errcode(ERRCODE_UNDEFINED_OBJECT),
-				 errmsg("role \"%s\" does not exist", stmt->role)));
-
+	tuple = get_rolespec_tuple(stmt->role);
+	authform = (Form_pg_authid) GETSTRUCT(tuple);
+	rolename = pstrdup(NameStr(authform->rolname));
 	roleid = HeapTupleGetOid(tuple);
 
 	/*
 	 * To mess with a superuser you gotta be superuser; else you need
 	 * createrole, or just want to change your own password
 	 */
-	if (((Form_pg_authid) GETSTRUCT(tuple))->rolsuper || issuper >= 0)
+	if (authform->rolsuper || issuper >= 0)
 	{
 		if (!superuser())
 			ereport(ERROR,
 					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 					 errmsg("must be superuser to alter superusers")));
 	}
-	else if (((Form_pg_authid) GETSTRUCT(tuple))->rolreplication || isreplication >= 0)
+	else if (authform->rolreplication || isreplication >= 0)
 	{
 		if (!superuser())
 			ereport(ERROR,
 					(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
 					 errmsg("must be superuser to alter replication users")));
 	}
-	else if (((Form_pg_authid) GETSTRUCT(tuple))->rolbypassrls || bypassrls >= 0)
+	else if (authform->rolbypassrls || bypassrls >= 0)
 	{
 		if (!superuser())
 			ereport(ERROR,
@@ -720,11 +719,11 @@ AlterRole(AlterRoleStmt *stmt)
 	 * Call the password checking hook if there is one defined
 	 */
 	if (check_password_hook && password)
-		(*check_password_hook) (stmt->role,
-								password,
-			   isMD5(password) ? PASSWORD_TYPE_MD5 : PASSWORD_TYPE_PLAINTEXT,
-								validUntil_datum,
-								validUntil_null);
+		(*check_password_hook)(rolename ,
+							   password,
+			 isMD5(password) ? PASSWORD_TYPE_MD5 : PASSWORD_TYPE_PLAINTEXT,
+							   validUntil_datum,
+							   validUntil_null);
 
 	/*
 	 * Build an updated tuple, perusing the information just obtained
@@ -794,7 +793,7 @@ AlterRole(AlterRoleStmt *stmt)
 				CStringGetTextDatum(password);
 		else
 		{
-			if (!pg_md5_encrypt(password, stmt->role, strlen(stmt->role),
+			if (!pg_md5_encrypt(password, rolename, strlen(rolename),
 								encrypted_password))
 				elog(ERROR, "password encryption failed");
 			new_record[Anum_pg_authid_rolpassword - 1] =
@@ -841,12 +840,12 @@ AlterRole(AlterRoleStmt *stmt)
 		CommandCounterIncrement();
 
 	if (stmt->action == +1)		/* add members to role */
-		AddRoleMems(stmt->role, roleid,
-					rolemembers, roleNamesToIds(rolemembers),
+		AddRoleMems(rolename, roleid,
+					rolemembers, roleSpecsToIds(rolemembers),
 					GetUserId(), false);
 	else if (stmt->action == -1)	/* drop members from role */
-		DelRoleMems(stmt->role, roleid,
-					rolemembers, roleNamesToIds(rolemembers),
+		DelRoleMems(rolename, roleid,
+					rolemembers, roleSpecsToIds(rolemembers),
 					false);
 
 	/*
@@ -870,13 +869,7 @@ AlterRoleSet(AlterRoleSetStmt *stmt)
 
 	if (stmt->role)
 	{
-		roletuple = SearchSysCache1(AUTHNAME, PointerGetDatum(stmt->role));
-
-		if (!HeapTupleIsValid(roletuple))
-			ereport(ERROR,
-					(errcode(ERRCODE_UNDEFINED_OBJECT),
-					 errmsg("role \"%s\" does not exist", stmt->role)));
-
+		roletuple = get_rolespec_tuple(stmt->role);
 		roleid = HeapTupleGetOid(roletuple);
 
 		/*
@@ -965,7 +958,8 @@ DropRole(DropRoleStmt *stmt)
 
 	foreach(item, stmt->roles)
 	{
-		const char *role = strVal(lfirst(item));
+		RoleSpec   *rolspec = lfirst(item);
+		char	   *role;
 		HeapTuple	tuple,
 					tmp_tuple;
 		ScanKeyData scankey;
@@ -974,6 +968,12 @@ DropRole(DropRoleStmt *stmt)
 		SysScanDesc sscan;
 		Oid			roleid;
 
+		if (rolspec->roletype != ROLESPEC_CSTRING)
+			ereport(ERROR,
+					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+					 errmsg("cannot use special role specifier in \"%s\"", "DROP ROLE")));
+		role = rolspec->rolename;
+
 		tuple = SearchSysCache1(AUTHNAME, PointerGetDatum(role));
 		if (!HeapTupleIsValid(tuple))
 		{
@@ -1243,11 +1243,11 @@ GrantRole(GrantRoleStmt *stmt)
 	ListCell   *item;
 
 	if (stmt->grantor)
-		grantor = get_role_oid(stmt->grantor, false);
+		grantor = get_rolespec_oid(stmt->grantor, false);
 	else
 		grantor = GetUserId();
 
-	grantee_ids = roleNamesToIds(stmt->grantee_roles);
+	grantee_ids = roleSpecsToIds(stmt->grantee_roles);
 
 	/* AccessShareLock is enough since we aren't modifying pg_authid */
 	pg_authid_rel = heap_open(AuthIdRelationId, AccessShareLock);
@@ -1296,7 +1296,7 @@ GrantRole(GrantRoleStmt *stmt)
 void
 DropOwnedObjects(DropOwnedStmt *stmt)
 {
-	List	   *role_ids = roleNamesToIds(stmt->roles);
+	List	   *role_ids = roleSpecsToIds(stmt->roles);
 	ListCell   *cell;
 
 	/* Check privileges */
@@ -1322,7 +1322,7 @@ DropOwnedObjects(DropOwnedStmt *stmt)
 void
 ReassignOwnedObjects(ReassignOwnedStmt *stmt)
 {
-	List	   *role_ids = roleNamesToIds(stmt->roles);
+	List	   *role_ids = roleSpecsToIds(stmt->roles);
 	ListCell   *cell;
 	Oid			newrole;
 
@@ -1338,7 +1338,7 @@ ReassignOwnedObjects(ReassignOwnedStmt *stmt)
 	}
 
 	/* Must have privileges on the receiving side too */
-	newrole = get_role_oid(stmt->newrole, false);
+	newrole = get_rolespec_oid(stmt->newrole, false);
 
 	if (!has_privs_of_role(GetUserId(), newrole))
 		ereport(ERROR,
@@ -1350,22 +1350,24 @@ ReassignOwnedObjects(ReassignOwnedStmt *stmt)
 }
 
 /*
- * roleNamesToIds
+ * roleSpecsToIds
  *
- * Given a list of role names (as String nodes), generate a list of role OIDs
- * in the same order.
+ * Given a list of RoleSpecs, generate a list of role OIDs in the same order.
+ *
+ * ROLESPEC_PUBLIC is not allowed.
  */
 List *
-roleNamesToIds(List *memberNames)
+roleSpecsToIds(List *memberNames)
 {
 	List	   *result = NIL;
 	ListCell   *l;
 
 	foreach(l, memberNames)
 	{
-		char	   *rolename = strVal(lfirst(l));
-		Oid			roleid = get_role_oid(rolename, false);
+		Node   *rolespec = (Node *) lfirst(l);
+		Oid		roleid;
 
+		roleid = get_rolespec_oid(rolespec, false);
 		result = lappend_oid(result, roleid);
 	}
 	return result;
@@ -1440,7 +1442,7 @@ AddRoleMems(const char *rolename, Oid roleid,
 
 	forboth(nameitem, memberNames, iditem, memberIds)
 	{
-		const char *membername = strVal(lfirst(nameitem));
+		RoleSpec   *member = lfirst(nameitem);
 		Oid			memberid = lfirst_oid(iditem);
 		HeapTuple	authmem_tuple;
 		HeapTuple	tuple;
@@ -1448,6 +1450,8 @@ AddRoleMems(const char *rolename, Oid roleid,
 		bool		new_record_nulls[Natts_pg_auth_members];
 		bool		new_record_repl[Natts_pg_auth_members];
 
+
+
 		/*
 		 * Refuse creation of membership loops, including the trivial case
 		 * where a role is made a member of itself.  We do this by checking to
diff --git a/src/backend/nodes/copyfuncs.c b/src/backend/nodes/copyfuncs.c
index 9fe8008..ebb6f3a 100644
--- a/src/backend/nodes/copyfuncs.c
+++ b/src/backend/nodes/copyfuncs.c
@@ -2504,6 +2504,18 @@ _copyXmlSerialize(const XmlSerialize *from)
 	return newnode;
 }
 
+static RoleSpec *
+_copyRoleSpec(const RoleSpec *from)
+{
+	RoleSpec *newnode = makeNode(RoleSpec);
+
+	COPY_SCALAR_FIELD(roletype);
+	COPY_STRING_FIELD(rolename);
+	COPY_LOCATION_FIELD(location);
+
+	return newnode;
+}
+
 static Query *
 _copyQuery(const Query *from)
 {
@@ -2650,6 +2662,7 @@ _copyAlterTableCmd(const AlterTableCmd *from)
 
 	COPY_SCALAR_FIELD(subtype);
 	COPY_STRING_FIELD(name);
+	COPY_NODE_FIELD(newowner);
 	COPY_NODE_FIELD(def);
 	COPY_SCALAR_FIELD(behavior);
 	COPY_SCALAR_FIELD(missing_ok);
@@ -2689,16 +2702,6 @@ _copyGrantStmt(const GrantStmt *from)
 	return newnode;
 }
 
-static PrivGrantee *
-_copyPrivGrantee(const PrivGrantee *from)
-{
-	PrivGrantee *newnode = makeNode(PrivGrantee);
-
-	COPY_STRING_FIELD(rolname);
-
-	return newnode;
-}
-
 static FuncWithArgs *
 _copyFuncWithArgs(const FuncWithArgs *from)
 {
@@ -2730,7 +2733,7 @@ _copyGrantRoleStmt(const GrantRoleStmt *from)
 	COPY_NODE_FIELD(grantee_roles);
 	COPY_SCALAR_FIELD(is_grant);
 	COPY_SCALAR_FIELD(admin_opt);
-	COPY_STRING_FIELD(grantor);
+	COPY_NODE_FIELD(grantor);
 	COPY_SCALAR_FIELD(behavior);
 
 	return newnode;
@@ -3038,7 +3041,7 @@ _copyAlterOwnerStmt(const AlterOwnerStmt *from)
 	COPY_NODE_FIELD(relation);
 	COPY_NODE_FIELD(object);
 	COPY_NODE_FIELD(objarg);
-	COPY_STRING_FIELD(newowner);
+	COPY_NODE_FIELD(newowner);
 
 	return newnode;
 }
@@ -3424,7 +3427,7 @@ _copyCreateTableSpaceStmt(const CreateTableSpaceStmt *from)
 	CreateTableSpaceStmt *newnode = makeNode(CreateTableSpaceStmt);
 
 	COPY_STRING_FIELD(tablespacename);
-	COPY_STRING_FIELD(owner);
+	COPY_NODE_FIELD(owner);
 	COPY_STRING_FIELD(location);
 	COPY_NODE_FIELD(options);
 
@@ -3561,7 +3564,7 @@ _copyCreateUserMappingStmt(const CreateUserMappingStmt *from)
 {
 	CreateUserMappingStmt *newnode = makeNode(CreateUserMappingStmt);
 
-	COPY_STRING_FIELD(username);
+	COPY_NODE_FIELD(user);
 	COPY_STRING_FIELD(servername);
 	COPY_NODE_FIELD(options);
 
@@ -3573,7 +3576,7 @@ _copyAlterUserMappingStmt(const AlterUserMappingStmt *from)
 {
 	AlterUserMappingStmt *newnode = makeNode(AlterUserMappingStmt);
 
-	COPY_STRING_FIELD(username);
+	COPY_NODE_FIELD(user);
 	COPY_STRING_FIELD(servername);
 	COPY_NODE_FIELD(options);
 
@@ -3585,7 +3588,7 @@ _copyDropUserMappingStmt(const DropUserMappingStmt *from)
 {
 	DropUserMappingStmt *newnode = makeNode(DropUserMappingStmt);
 
-	COPY_STRING_FIELD(username);
+	COPY_NODE_FIELD(user);
 	COPY_STRING_FIELD(servername);
 	COPY_SCALAR_FIELD(missing_ok);
 
@@ -3698,7 +3701,7 @@ _copyAlterRoleStmt(const AlterRoleStmt *from)
 {
 	AlterRoleStmt *newnode = makeNode(AlterRoleStmt);
 
-	COPY_STRING_FIELD(role);
+	COPY_NODE_FIELD(role);
 	COPY_NODE_FIELD(options);
 	COPY_SCALAR_FIELD(action);
 
@@ -3710,7 +3713,7 @@ _copyAlterRoleSetStmt(const AlterRoleSetStmt *from)
 {
 	AlterRoleSetStmt *newnode = makeNode(AlterRoleSetStmt);
 
-	COPY_STRING_FIELD(role);
+	COPY_NODE_FIELD(role);
 	COPY_STRING_FIELD(database);
 	COPY_NODE_FIELD(setstmt);
 
@@ -3769,7 +3772,7 @@ _copyCreateSchemaStmt(const CreateSchemaStmt *from)
 	CreateSchemaStmt *newnode = makeNode(CreateSchemaStmt);
 
 	COPY_STRING_FIELD(schemaname);
-	COPY_STRING_FIELD(authid);
+	COPY_NODE_FIELD(authrole);
 	COPY_NODE_FIELD(schemaElts);
 	COPY_SCALAR_FIELD(if_not_exists);
 
@@ -3854,7 +3857,7 @@ _copyReassignOwnedStmt(const ReassignOwnedStmt *from)
 	ReassignOwnedStmt *newnode = makeNode(ReassignOwnedStmt);
 
 	COPY_NODE_FIELD(roles);
-	COPY_STRING_FIELD(newrole);
+	COPY_NODE_FIELD(newrole);
 
 	return newnode;
 }
@@ -4728,9 +4731,6 @@ copyObject(const void *from)
 		case T_CommonTableExpr:
 			retval = _copyCommonTableExpr(from);
 			break;
-		case T_PrivGrantee:
-			retval = _copyPrivGrantee(from);
-			break;
 		case T_FuncWithArgs:
 			retval = _copyFuncWithArgs(from);
 			break;
@@ -4740,6 +4740,9 @@ copyObject(const void *from)
 		case T_XmlSerialize:
 			retval = _copyXmlSerialize(from);
 			break;
+		case T_RoleSpec:
+			retval = _copyRoleSpec(from);
+			break;
 
 		default:
 			elog(ERROR, "unrecognized node type: %d", (int) nodeTag(from));
diff --git a/src/backend/nodes/equalfuncs.c b/src/backend/nodes/equalfuncs.c
index fe509b0..8186e84 100644
--- a/src/backend/nodes/equalfuncs.c
+++ b/src/backend/nodes/equalfuncs.c
@@ -973,6 +973,7 @@ _equalAlterTableCmd(const AlterTableCmd *a, const AlterTableCmd *b)
 {
 	COMPARE_SCALAR_FIELD(subtype);
 	COMPARE_STRING_FIELD(name);
+	COMPARE_NODE_FIELD(newowner);
 	COMPARE_NODE_FIELD(def);
 	COMPARE_SCALAR_FIELD(behavior);
 	COMPARE_SCALAR_FIELD(missing_ok);
@@ -1009,14 +1010,6 @@ _equalGrantStmt(const GrantStmt *a, const GrantStmt *b)
 }
 
 static bool
-_equalPrivGrantee(const PrivGrantee *a, const PrivGrantee *b)
-{
-	COMPARE_STRING_FIELD(rolname);
-
-	return true;
-}
-
-static bool
 _equalFuncWithArgs(const FuncWithArgs *a, const FuncWithArgs *b)
 {
 	COMPARE_NODE_FIELD(funcname);
@@ -1041,7 +1034,7 @@ _equalGrantRoleStmt(const GrantRoleStmt *a, const GrantRoleStmt *b)
 	COMPARE_NODE_FIELD(grantee_roles);
 	COMPARE_SCALAR_FIELD(is_grant);
 	COMPARE_SCALAR_FIELD(admin_opt);
-	COMPARE_STRING_FIELD(grantor);
+	COMPARE_NODE_FIELD(grantor);
 	COMPARE_SCALAR_FIELD(behavior);
 
 	return true;
@@ -1295,7 +1288,7 @@ _equalAlterOwnerStmt(const AlterOwnerStmt *a, const AlterOwnerStmt *b)
 	COMPARE_NODE_FIELD(relation);
 	COMPARE_NODE_FIELD(object);
 	COMPARE_NODE_FIELD(objarg);
-	COMPARE_STRING_FIELD(newowner);
+	COMPARE_NODE_FIELD(newowner);
 
 	return true;
 }
@@ -1618,7 +1611,7 @@ static bool
 _equalCreateTableSpaceStmt(const CreateTableSpaceStmt *a, const CreateTableSpaceStmt *b)
 {
 	COMPARE_STRING_FIELD(tablespacename);
-	COMPARE_STRING_FIELD(owner);
+	COMPARE_NODE_FIELD(owner);
 	COMPARE_STRING_FIELD(location);
 	COMPARE_NODE_FIELD(options);
 
@@ -1735,7 +1728,7 @@ _equalAlterForeignServerStmt(const AlterForeignServerStmt *a, const AlterForeign
 static bool
 _equalCreateUserMappingStmt(const CreateUserMappingStmt *a, const CreateUserMappingStmt *b)
 {
-	COMPARE_STRING_FIELD(username);
+	COMPARE_NODE_FIELD(user);
 	COMPARE_STRING_FIELD(servername);
 	COMPARE_NODE_FIELD(options);
 
@@ -1745,7 +1738,7 @@ _equalCreateUserMappingStmt(const CreateUserMappingStmt *a, const CreateUserMapp
 static bool
 _equalAlterUserMappingStmt(const AlterUserMappingStmt *a, const AlterUserMappingStmt *b)
 {
-	COMPARE_STRING_FIELD(username);
+	COMPARE_NODE_FIELD(user);
 	COMPARE_STRING_FIELD(servername);
 	COMPARE_NODE_FIELD(options);
 
@@ -1755,7 +1748,7 @@ _equalAlterUserMappingStmt(const AlterUserMappingStmt *a, const AlterUserMapping
 static bool
 _equalDropUserMappingStmt(const DropUserMappingStmt *a, const DropUserMappingStmt *b)
 {
-	COMPARE_STRING_FIELD(username);
+	COMPARE_NODE_FIELD(user);
 	COMPARE_STRING_FIELD(servername);
 	COMPARE_SCALAR_FIELD(missing_ok);
 
@@ -1853,7 +1846,7 @@ _equalCreateRoleStmt(const CreateRoleStmt *a, const CreateRoleStmt *b)
 static bool
 _equalAlterRoleStmt(const AlterRoleStmt *a, const AlterRoleStmt *b)
 {
-	COMPARE_STRING_FIELD(role);
+	COMPARE_NODE_FIELD(role);
 	COMPARE_NODE_FIELD(options);
 	COMPARE_SCALAR_FIELD(action);
 
@@ -1863,7 +1856,7 @@ _equalAlterRoleStmt(const AlterRoleStmt *a, const AlterRoleStmt *b)
 static bool
 _equalAlterRoleSetStmt(const AlterRoleSetStmt *a, const AlterRoleSetStmt *b)
 {
-	COMPARE_STRING_FIELD(role);
+	COMPARE_NODE_FIELD(role);
 	COMPARE_STRING_FIELD(database);
 	COMPARE_NODE_FIELD(setstmt);
 
@@ -1912,7 +1905,7 @@ static bool
 _equalCreateSchemaStmt(const CreateSchemaStmt *a, const CreateSchemaStmt *b)
 {
 	COMPARE_STRING_FIELD(schemaname);
-	COMPARE_STRING_FIELD(authid);
+	COMPARE_NODE_FIELD(authrole);
 	COMPARE_NODE_FIELD(schemaElts);
 	COMPARE_SCALAR_FIELD(if_not_exists);
 
@@ -1983,7 +1976,7 @@ static bool
 _equalReassignOwnedStmt(const ReassignOwnedStmt *a, const ReassignOwnedStmt *b)
 {
 	COMPARE_NODE_FIELD(roles);
-	COMPARE_STRING_FIELD(newrole);
+	COMPARE_NODE_FIELD(newrole);
 
 	return true;
 }
@@ -2455,6 +2448,16 @@ _equalXmlSerialize(const XmlSerialize *a, const XmlSerialize *b)
 	return true;
 }
 
+static bool
+_equalRoleSpec(const RoleSpec *a, const RoleSpec *b)
+{
+	COMPARE_SCALAR_FIELD(roletype);
+	COMPARE_STRING_FIELD(rolename);
+	COMPARE_LOCATION_FIELD(location);
+
+	return true;
+}
+
 /*
  * Stuff from pg_list.h
  */
@@ -3153,9 +3156,6 @@ equal(const void *a, const void *b)
 		case T_CommonTableExpr:
 			retval = _equalCommonTableExpr(a, b);
 			break;
-		case T_PrivGrantee:
-			retval = _equalPrivGrantee(a, b);
-			break;
 		case T_FuncWithArgs:
 			retval = _equalFuncWithArgs(a, b);
 			break;
@@ -3165,6 +3165,9 @@ equal(const void *a, const void *b)
 		case T_XmlSerialize:
 			retval = _equalXmlSerialize(a, b);
 			break;
+		case T_RoleSpec:
+			retval = _equalRoleSpec(a, b);
+			break;
 
 		default:
 			elog(ERROR, "unrecognized node type: %d",
diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y
index 581f7a1..b668a90 100644
--- a/src/backend/parser/gram.y
+++ b/src/backend/parser/gram.y
@@ -143,6 +143,7 @@ static Node *makeBitStringConst(char *str, int location);
 static Node *makeNullAConst(int location);
 static Node *makeAConst(Value *v, int location);
 static Node *makeBoolAConst(bool state, int location);
+static Node *makeRoleSpec(RoleSpecType type, int location);
 static void check_qualified_name(List *names, core_yyscan_t yyscanner);
 static List *check_func_name(List *names, core_yyscan_t yyscanner);
 static List *check_indirection(List *indirection, core_yyscan_t yyscanner);
@@ -291,7 +292,6 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 
 %type <str>		opt_type
 %type <str>		foreign_server_version opt_foreign_server_version
-%type <str>		auth_ident
 %type <str>		opt_in_database
 
 %type <str>		OptSchemaName
@@ -474,12 +474,13 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 
 %type <ival>	Iconst SignedIconst
 %type <str>		Sconst comment_text notify_payload
-%type <str>		RoleId opt_granted_by opt_boolean_or_string
+%type <str>		RoleId opt_boolean_or_string
 %type <list>	var_list
 %type <str>		ColId ColLabel var_name type_function_name param_name
 %type <str>		NonReservedWord NonReservedWord_or_Sconst
 %type <str>		createdb_opt_name
 %type <node>	var_value zone_value
+%type <node>	auth_ident RoleSpec opt_granted_by
 
 %type <keyword> unreserved_keyword type_func_name_keyword
 %type <keyword> col_name_keyword reserved_keyword
@@ -494,7 +495,8 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 
 %type <list>	constraints_set_list
 %type <boolean> constraints_set_mode
-%type <str>		OptTableSpace OptConsTableSpace OptTableSpaceOwner
+%type <str>		OptTableSpace OptConsTableSpace
+%type <node>	OptTableSpaceOwner
 %type <ival>	opt_check_option
 
 %type <str>		opt_provider security_label
@@ -871,7 +873,6 @@ CreateRoleStmt:
 				}
 		;
 
-
 opt_with:	WITH									{}
 			| WITH_LA								{}
 			| /*EMPTY*/								{}
@@ -1037,7 +1038,7 @@ CreateUserStmt:
  *****************************************************************************/
 
 AlterRoleStmt:
-			ALTER ROLE RoleId opt_with AlterOptRoleList
+			ALTER ROLE RoleSpec opt_with AlterOptRoleList
 				 {
 					AlterRoleStmt *n = makeNode(AlterRoleStmt);
 					n->role = $3;
@@ -1053,7 +1054,7 @@ opt_in_database:
 		;
 
 AlterRoleSetStmt:
-			ALTER ROLE RoleId opt_in_database SetResetClause
+			ALTER ROLE RoleSpec opt_in_database SetResetClause
 				{
 					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
 					n->role = $3;
@@ -1079,7 +1080,7 @@ AlterRoleSetStmt:
  *****************************************************************************/
 
 AlterUserStmt:
-			ALTER USER RoleId opt_with AlterOptRoleList
+			ALTER USER RoleSpec opt_with AlterOptRoleList
 				 {
 					AlterRoleStmt *n = makeNode(AlterRoleStmt);
 					n->role = $3;
@@ -1091,7 +1092,7 @@ AlterUserStmt:
 
 
 AlterUserSetStmt:
-			ALTER USER RoleId SetResetClause
+			ALTER USER RoleSpec SetResetClause
 				{
 					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
 					n->role = $3;
@@ -1180,7 +1181,7 @@ CreateGroupStmt:
  *****************************************************************************/
 
 AlterGroupStmt:
-			ALTER GROUP_P RoleId add_drop USER role_list
+			ALTER GROUP_P RoleSpec add_drop USER role_list
 				{
 					AlterRoleStmt *n = makeNode(AlterRoleStmt);
 					n->role = $3;
@@ -1228,15 +1229,12 @@ DropGroupStmt:
  *****************************************************************************/
 
 CreateSchemaStmt:
-			CREATE SCHEMA OptSchemaName AUTHORIZATION RoleId OptSchemaEltList
+			CREATE SCHEMA OptSchemaName AUTHORIZATION RoleSpec OptSchemaEltList
 				{
 					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
 					/* One can omit the schema name or the authorization id. */
-					if ($3 != NULL)
-						n->schemaname = $3;
-					else
-						n->schemaname = $5;
-					n->authid = $5;
+					n->schemaname = $3;
+					n->authrole = $5;
 					n->schemaElts = $6;
 					n->if_not_exists = false;
 					$$ = (Node *)n;
@@ -1246,20 +1244,17 @@ CreateSchemaStmt:
 					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
 					/* ...but not both */
 					n->schemaname = $3;
-					n->authid = NULL;
+					n->authrole = NULL;
 					n->schemaElts = $4;
 					n->if_not_exists = false;
 					$$ = (Node *)n;
 				}
-			| CREATE SCHEMA IF_P NOT EXISTS OptSchemaName AUTHORIZATION RoleId OptSchemaEltList
+			| CREATE SCHEMA IF_P NOT EXISTS OptSchemaName AUTHORIZATION RoleSpec OptSchemaEltList
 				{
 					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
-					/* One can omit the schema name or the authorization id. */
-					if ($6 != NULL)
-						n->schemaname = $6;
-					else
-						n->schemaname = $8;
-					n->authid = $8;
+					/* schema name can be omitted here, too */
+					n->schemaname = $6;
+					n->authrole = $8;
 					if ($9 != NIL)
 						ereport(ERROR,
 								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
@@ -1272,9 +1267,9 @@ CreateSchemaStmt:
 			| CREATE SCHEMA IF_P NOT EXISTS ColId OptSchemaEltList
 				{
 					CreateSchemaStmt *n = makeNode(CreateSchemaStmt);
-					/* ...but not both */
+					/* ...but not here */
 					n->schemaname = $6;
-					n->authid = NULL;
+					n->authrole = NULL;
 					if ($7 != NIL)
 						ereport(ERROR,
 								(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
@@ -2259,12 +2254,12 @@ alter_table_cmd:
 					n->subtype = AT_DropOf;
 					$$ = (Node *)n;
 				}
-			/* ALTER TABLE <name> OWNER TO RoleId */
-			| OWNER TO RoleId
+			/* ALTER TABLE <name> OWNER TO RoleSpec */
+			| OWNER TO RoleSpec
 				{
 					AlterTableCmd *n = makeNode(AlterTableCmd);
 					n->subtype = AT_ChangeOwner;
-					n->name = $3;
+					n->newowner = $3;
 					$$ = (Node *)n;
 				}
 			/* ALTER TABLE <name> SET TABLESPACE <tablespacename> */
@@ -3756,7 +3751,7 @@ CreateTableSpaceStmt: CREATE TABLESPACE name OptTableSpaceOwner LOCATION Sconst
 				}
 		;
 
-OptTableSpaceOwner: OWNER name			{ $$ = $2; }
+OptTableSpaceOwner: OWNER RoleSpec		{ $$ = $2; }
 			| /*EMPTY */				{ $$ = NULL; }
 		;
 
@@ -4478,7 +4473,7 @@ import_qualification:
 CreateUserMappingStmt: CREATE USER MAPPING FOR auth_ident SERVER name create_generic_options
 				{
 					CreateUserMappingStmt *n = makeNode(CreateUserMappingStmt);
-					n->username = $5;
+					n->user = $5;
 					n->servername = $7;
 					n->options = $8;
 					$$ = (Node *) n;
@@ -4486,10 +4481,8 @@ CreateUserMappingStmt: CREATE USER MAPPING FOR auth_ident SERVER name create_gen
 		;
 
 /* User mapping authorization identifier */
-auth_ident:
-			CURRENT_USER	{ $$ = "current_user"; }
-		|	USER			{ $$ = "current_user"; }
-		|	RoleId			{ $$ = (strcmp($1, "public") == 0) ? NULL : $1; }
+auth_ident: RoleSpec			{ $$ = $1; }
+			| USER				{ $$ = makeRoleSpec(ROLESPEC_CURRENT_USER, @1); }
 		;
 
 /*****************************************************************************
@@ -4502,7 +4495,7 @@ auth_ident:
 DropUserMappingStmt: DROP USER MAPPING FOR auth_ident SERVER name
 				{
 					DropUserMappingStmt *n = makeNode(DropUserMappingStmt);
-					n->username = $5;
+					n->user = $5;
 					n->servername = $7;
 					n->missing_ok = false;
 					$$ = (Node *) n;
@@ -4510,7 +4503,7 @@ DropUserMappingStmt: DROP USER MAPPING FOR auth_ident SERVER name
 				|  DROP USER MAPPING IF_P EXISTS FOR auth_ident SERVER name
 				{
 					DropUserMappingStmt *n = makeNode(DropUserMappingStmt);
-					n->username = $7;
+					n->user = $7;
 					n->servername = $9;
 					n->missing_ok = true;
 					$$ = (Node *) n;
@@ -4527,7 +4520,7 @@ DropUserMappingStmt: DROP USER MAPPING FOR auth_ident SERVER name
 AlterUserMappingStmt: ALTER USER MAPPING FOR auth_ident SERVER name alter_generic_options
 				{
 					AlterUserMappingStmt *n = makeNode(AlterUserMappingStmt);
-					n->username = $5;
+					n->user = $5;
 					n->servername = $7;
 					n->options = $8;
 					$$ = (Node *) n;
@@ -4612,7 +4605,7 @@ RowSecurityOptionalWithCheck:
 
 RowSecurityDefaultToRole:
 			TO role_list			{ $$ = $2; }
-			| /* EMPTY */			{ $$ = list_make1(makeString("public")); }
+			| /* EMPTY */			{ $$ = list_make1(makeRoleSpec(ROLESPEC_PUBLIC, -1)); }
 		;
 
 RowSecurityOptionalToRole:
@@ -5432,7 +5425,7 @@ DropOwnedStmt:
 		;
 
 ReassignOwnedStmt:
-			REASSIGN OWNED BY role_list TO name
+			REASSIGN OWNED BY role_list TO RoleSpec
 				{
 					ReassignOwnedStmt *n = makeNode(ReassignOwnedStmt);
 					n->roles = $4;
@@ -6348,26 +6341,9 @@ grantee_list:
 			| grantee_list ',' grantee				{ $$ = lappend($1, $3); }
 		;
 
-grantee:	RoleId
-				{
-					PrivGrantee *n = makeNode(PrivGrantee);
-					/* This hack lets us avoid reserving PUBLIC as a keyword*/
-					if (strcmp($1, "public") == 0)
-						n->rolname = NULL;
-					else
-						n->rolname = $1;
-					$$ = (Node *)n;
-				}
-			| GROUP_P RoleId
-				{
-					PrivGrantee *n = makeNode(PrivGrantee);
-					/* Treat GROUP PUBLIC as a synonym for PUBLIC */
-					if (strcmp($2, "public") == 0)
-						n->rolname = NULL;
-					else
-						n->rolname = $2;
-					$$ = (Node *)n;
-				}
+grantee:
+			RoleSpec								{ $$ = $1; }
+			| GROUP_P RoleSpec						{ $$ = $2; }
 		;
 
 
@@ -6438,7 +6414,7 @@ opt_grant_admin_option: WITH ADMIN OPTION				{ $$ = TRUE; }
 			| /*EMPTY*/									{ $$ = FALSE; }
 		;
 
-opt_granted_by: GRANTED BY RoleId						{ $$ = $3; }
+opt_granted_by: GRANTED BY RoleSpec						{ $$ = $3; }
 			| /*EMPTY*/									{ $$ = NULL; }
 		;
 
@@ -8104,7 +8080,7 @@ AlterObjectSchemaStmt:
  *
  *****************************************************************************/
 
-AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
+AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_AGGREGATE;
@@ -8113,7 +8089,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $7;
 					$$ = (Node *)n;
 				}
-			| ALTER COLLATION any_name OWNER TO RoleId
+			| ALTER COLLATION any_name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_COLLATION;
@@ -8121,7 +8097,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER CONVERSION_P any_name OWNER TO RoleId
+			| ALTER CONVERSION_P any_name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_CONVERSION;
@@ -8129,7 +8105,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER DATABASE database_name OWNER TO RoleId
+			| ALTER DATABASE database_name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_DATABASE;
@@ -8137,7 +8113,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER DOMAIN_P any_name OWNER TO RoleId
+			| ALTER DOMAIN_P any_name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_DOMAIN;
@@ -8145,7 +8121,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER FUNCTION function_with_argtypes OWNER TO RoleId
+			| ALTER FUNCTION function_with_argtypes OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_FUNCTION;
@@ -8154,7 +8130,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER opt_procedural LANGUAGE name OWNER TO RoleId
+			| ALTER opt_procedural LANGUAGE name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_LANGUAGE;
@@ -8162,7 +8138,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $7;
 					$$ = (Node *)n;
 				}
-			| ALTER LARGE_P OBJECT_P NumericOnly OWNER TO RoleId
+			| ALTER LARGE_P OBJECT_P NumericOnly OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_LARGEOBJECT;
@@ -8170,7 +8146,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $7;
 					$$ = (Node *)n;
 				}
-			| ALTER OPERATOR any_operator oper_argtypes OWNER TO RoleId
+			| ALTER OPERATOR any_operator oper_argtypes OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_OPERATOR;
@@ -8179,7 +8155,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $7;
 					$$ = (Node *)n;
 				}
-			| ALTER OPERATOR CLASS any_name USING access_method OWNER TO RoleId
+			| ALTER OPERATOR CLASS any_name USING access_method OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_OPCLASS;
@@ -8188,7 +8164,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $9;
 					$$ = (Node *)n;
 				}
-			| ALTER OPERATOR FAMILY any_name USING access_method OWNER TO RoleId
+			| ALTER OPERATOR FAMILY any_name USING access_method OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_OPFAMILY;
@@ -8197,7 +8173,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $9;
 					$$ = (Node *)n;
 				}
-			| ALTER SCHEMA name OWNER TO RoleId
+			| ALTER SCHEMA name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_SCHEMA;
@@ -8205,7 +8181,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER TYPE_P any_name OWNER TO RoleId
+			| ALTER TYPE_P any_name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_TYPE;
@@ -8213,7 +8189,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER TABLESPACE name OWNER TO RoleId
+			| ALTER TABLESPACE name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_TABLESPACE;
@@ -8221,7 +8197,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER TEXT_P SEARCH DICTIONARY any_name OWNER TO RoleId
+			| ALTER TEXT_P SEARCH DICTIONARY any_name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_TSDICTIONARY;
@@ -8229,7 +8205,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $8;
 					$$ = (Node *)n;
 				}
-			| ALTER TEXT_P SEARCH CONFIGURATION any_name OWNER TO RoleId
+			| ALTER TEXT_P SEARCH CONFIGURATION any_name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_TSCONFIGURATION;
@@ -8237,7 +8213,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $8;
 					$$ = (Node *)n;
 				}
-			| ALTER FOREIGN DATA_P WRAPPER name OWNER TO RoleId
+			| ALTER FOREIGN DATA_P WRAPPER name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_FDW;
@@ -8245,7 +8221,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $8;
 					$$ = (Node *)n;
 				}
-			| ALTER SERVER name OWNER TO RoleId
+			| ALTER SERVER name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_FOREIGN_SERVER;
@@ -8253,7 +8229,7 @@ AlterOwnerStmt: ALTER AGGREGATE func_name aggr_args OWNER TO RoleId
 					n->newowner = $6;
 					$$ = (Node *)n;
 				}
-			| ALTER EVENT TRIGGER name OWNER TO RoleId
+			| ALTER EVENT TRIGGER name OWNER TO RoleSpec
 				{
 					AlterOwnerStmt *n = makeNode(AlterOwnerStmt);
 					n->objectType = OBJECT_EVENT_TRIGGER;
@@ -13113,19 +13089,86 @@ AexprConst: Iconst
 
 Iconst:		ICONST									{ $$ = $1; };
 Sconst:		SCONST									{ $$ = $1; };
-RoleId:		NonReservedWord							{ $$ = $1; };
-
-role_list:	RoleId
-					{ $$ = list_make1(makeString($1)); }
-			| role_list ',' RoleId
-					{ $$ = lappend($1, makeString($3)); }
-		;
 
 SignedIconst: Iconst								{ $$ = $1; }
 			| '+' Iconst							{ $$ = + $2; }
 			| '-' Iconst							{ $$ = - $2; }
 		;
 
+/* Role specifications */
+RoleId:		RoleSpec
+				{
+					RoleSpec *spc = (RoleSpec *) $1;
+					switch (spc->roletype)
+					{
+						case ROLESPEC_CSTRING:
+							$$ = spc->rolename;
+							break;
+						case ROLESPEC_PUBLIC:
+							ereport(ERROR,
+									(errcode(ERRCODE_RESERVED_NAME),
+									 errmsg("role name \"%s\" is reserved",
+											"public"),
+									 errposition(@1)));
+						case ROLESPEC_SESSION_USER:
+							ereport(ERROR,
+									(errcode(ERRCODE_RESERVED_NAME),
+									 errmsg("%s cannot be used as a role name",
+											"SESSION_USER"),
+									 errposition(@1)));
+						case ROLESPEC_CURRENT_USER:
+							ereport(ERROR,
+									(errcode(ERRCODE_RESERVED_NAME),
+									 errmsg("%s cannot be used as a role name",
+											"CURRENT_USER"),
+									 errposition(@1)));
+					}
+				}
+			;
+
+RoleSpec:	NonReservedWord
+					{
+						/*
+						 * "public" and "none" are not keywords, but they must
+						 * be treated specially here.
+						 */
+						RoleSpec *n;
+						if (strcmp($1, "public") == 0)
+						{
+							n = (RoleSpec *) makeRoleSpec(ROLESPEC_PUBLIC, @1);
+							n->roletype = ROLESPEC_PUBLIC;
+						}
+						else if (strcmp($1, "none") == 0)
+						{
+							ereport(ERROR,
+									(errcode(ERRCODE_RESERVED_NAME),
+									 errmsg("role name \"%s\" is reserved",
+											"none"),
+									 parser_errposition(@1)));
+						}
+						else
+						{
+							n = (RoleSpec *) makeRoleSpec(ROLESPEC_CSTRING, @1);
+							n->rolename = pstrdup($1);
+						}
+						$$ = (Node *) n;
+					}
+			| CURRENT_USER
+					{
+						$$ = makeRoleSpec(ROLESPEC_CURRENT_USER, @1);
+					}
+			| SESSION_USER
+					{
+						$$ = makeRoleSpec(ROLESPEC_SESSION_USER, @1);
+					}
+		;
+
+role_list:	RoleSpec
+					{ $$ = list_make1($1); }
+			| role_list ',' RoleSpec
+					{ $$ = lappend($1, $3); }
+		;
+
 /*
  * Name classification hierarchy.
  *
@@ -13812,6 +13855,20 @@ makeBoolAConst(bool state, int location)
 	return makeTypeCast((Node *)n, SystemTypeName("bool"), -1);
 }
 
+/* makeRoleSpec
+ * Create a RoleSpec with the given type
+ */
+static Node *
+makeRoleSpec(RoleSpecType type, int location)
+{
+	RoleSpec *spec = makeNode(RoleSpec);
+
+	spec->roletype = type;
+	spec->location = location;
+
+	return (Node *) spec;
+}
+
 /* check_qualified_name --- check the result of qualified_name production
  *
  * It's easiest to let the grammar production for qualified_name allow
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index c29f106..1e6da9c 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -90,7 +90,7 @@ typedef struct
 {
 	const char *stmtType;		/* "CREATE SCHEMA" or "ALTER SCHEMA" */
 	char	   *schemaname;		/* name of schema */
-	char	   *authid;			/* owner of schema */
+	RoleSpec   *authrole;		/* owner of schema */
 	List	   *sequences;		/* CREATE SEQUENCE items */
 	List	   *tables;			/* CREATE TABLE items */
 	List	   *views;			/* CREATE VIEW items */
@@ -2723,7 +2723,7 @@ transformCreateSchemaStmt(CreateSchemaStmt *stmt)
 
 	cxt.stmtType = "CREATE SCHEMA";
 	cxt.schemaname = stmt->schemaname;
-	cxt.authid = stmt->authid;
+	cxt.authrole = (RoleSpec *) stmt->authrole;
 	cxt.sequences = NIL;
 	cxt.tables = NIL;
 	cxt.views = NIL;
diff --git a/src/backend/utils/adt/acl.c b/src/backend/utils/adt/acl.c
index 411d779..d4b5364 100644
--- a/src/backend/utils/adt/acl.c
+++ b/src/backend/utils/adt/acl.c
@@ -5133,3 +5133,99 @@ get_role_oid_or_public(const char *rolname)
 
 	return get_role_oid(rolname, false);
 }
+
+/*
+ * Given a RoleSpec node, return the OID it points to.  If missing_ok is true,
+ * return InvalidOid if the role does not exist.
+ *
+ * PUBLIC is always disallowed here.  Routines wanting to handle the PUBLIC
+ * case must check the case separately.
+ */
+Oid
+get_rolespec_oid(const Node *node, bool missing_ok)
+{
+	RoleSpec   *role;
+	Oid			oid;
+
+	if (!IsA(node, RoleSpec))
+		elog(ERROR, "invalid node type %d", node->type);
+
+	role = (RoleSpec *) node;
+	switch (role->roletype)
+	{
+		case ROLESPEC_CSTRING:
+			Assert(role->rolename);
+			oid = get_role_oid(role->rolename, missing_ok);
+			break;
+
+		case ROLESPEC_CURRENT_USER:
+			oid = GetUserId();
+			break;
+
+		case ROLESPEC_SESSION_USER:
+			oid = GetSessionUserId();
+			break;
+
+		case ROLESPEC_PUBLIC:
+			ereport(ERROR,
+					(errcode(ERRCODE_UNDEFINED_OBJECT),
+					 errmsg("role \"%s\" does not exist", "public")));
+			oid = InvalidOid;	/* make compiler happy */
+			break;
+
+		default:
+			elog(ERROR, "unexpected role type %d", role->roletype);
+	}
+
+	return oid;
+}
+
+/*
+ * Given a RoleSpec node, return the cached HeapTuple it points to.  Caller
+ * must ReleaseSysCache when done with the result tuple.
+ */
+HeapTuple
+get_rolespec_tuple(const Node *node)
+{
+	RoleSpec   *role;
+	HeapTuple	tuple;
+
+	role = (RoleSpec *) node;
+	if (!IsA(node, RoleSpec))
+		elog(ERROR, "invalid node type %d", node->type);
+
+	switch (role->roletype)
+	{
+		case ROLESPEC_CSTRING:
+			Assert(role->rolename);
+			tuple = SearchSysCache1(AUTHNAME, CStringGetDatum(role->rolename));
+			if (!HeapTupleIsValid(tuple))
+				ereport(ERROR,
+						(errcode(ERRCODE_UNDEFINED_OBJECT),
+						 errmsg("role \"%s\" does not exist", role->rolename)));
+			break;
+
+		case ROLESPEC_CURRENT_USER:
+			tuple = SearchSysCache1(AUTHOID, GetUserId());
+			if (!HeapTupleIsValid(tuple))
+				elog(ERROR, "cache lookup failed for role %u", GetUserId());
+			break;
+
+		case ROLESPEC_SESSION_USER:
+			tuple = SearchSysCache1(AUTHOID, GetSessionUserId());
+			if (!HeapTupleIsValid(tuple))
+				elog(ERROR, "cache lookup failed for role %u", GetSessionUserId());
+			break;
+
+		case ROLESPEC_PUBLIC:
+			ereport(ERROR,
+					(errcode(ERRCODE_UNDEFINED_OBJECT),
+					 errmsg("role \"%s\" does not exist", "public")));
+			tuple = NULL;	/* make compiler happy */
+
+		default:
+			elog(ERROR, "unexpected role type %d", role->roletype);
+	}
+
+	return tuple;
+}
diff --git a/src/include/commands/user.h b/src/include/commands/user.h
index ccadb04..d35cb0c 100644
--- a/src/include/commands/user.h
+++ b/src/include/commands/user.h
@@ -31,6 +31,6 @@ extern void GrantRole(GrantRoleStmt *stmt);
 extern ObjectAddress RenameRole(const char *oldname, const char *newname);
 extern void DropOwnedObjects(DropOwnedStmt *stmt);
 extern void ReassignOwnedObjects(ReassignOwnedStmt *stmt);
-extern List *roleNamesToIds(List *memberNames);
+extern List *roleSpecsToIds(List *memberNames);
 
 #endif   /* USER_H */
diff --git a/src/include/nodes/nodes.h b/src/include/nodes/nodes.h
index 97ef0fc..38469ef 100644
--- a/src/include/nodes/nodes.h
+++ b/src/include/nodes/nodes.h
@@ -413,6 +413,7 @@ typedef enum NodeTag
 	T_XmlSerialize,
 	T_WithClause,
 	T_CommonTableExpr,
+	T_RoleSpec,
 
 	/*
 	 * TAGS FOR REPLICATION GRAMMAR PARSE NODES (replnodes.h)
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index ac13302..497559d 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -285,6 +285,25 @@ typedef struct CollateClause
 } CollateClause;
 
 /*
+ * RoleSpec - a role name or one of a few special values.
+ */
+typedef enum RoleSpecType
+{
+	ROLESPEC_CSTRING,		/* role name is stored as a C string */
+	ROLESPEC_CURRENT_USER,	/* role spec is CURRENT_USER */
+	ROLESPEC_SESSION_USER,	/* role spec is SESSION_USER */
+	ROLESPEC_PUBLIC			/* role name is "public" */
+} RoleSpecType;
+
+typedef struct RoleSpec
+{
+	NodeTag		type;
+	RoleSpecType roletype;	/* Type of this rolespec */
+	char	   *rolename;	/* filled only for ROLESPEC_CSTRING */
+	int			location;	/* token location, or -1 if unknown */
+} RoleSpec;
+
+/*
  * FuncCall - a function or aggregate invocation
  *
  * agg_order (if not NIL) indicates we saw 'foo(... ORDER BY ...)', or if
@@ -1263,7 +1282,7 @@ typedef struct CreateSchemaStmt
 {
 	NodeTag		type;
 	char	   *schemaname;		/* the name of the schema to create */
-	char	   *authid;			/* the owner of the created schema */
+	Node	   *authrole;		/* the owner of the created schema */
 	List	   *schemaElts;		/* schema components (list of parsenodes) */
 	bool		if_not_exists;	/* just do nothing if schema already exists? */
 } CreateSchemaStmt;
@@ -1362,7 +1381,8 @@ typedef struct AlterTableCmd	/* one subcommand of an ALTER TABLE */
 	NodeTag		type;
 	AlterTableType subtype;		/* Type of table alteration to apply */
 	char	   *name;			/* column, constraint, or trigger to act on,
-								 * or new owner or tablespace */
+								 * or tablespace */
+	Node	   *newowner;		/* RoleSpec */
 	Node	   *def;			/* definition of new column, index,
 								 * constraint, or parent table */
 	DropBehavior behavior;		/* RESTRICT or CASCADE for DROP cases */
@@ -1434,17 +1454,11 @@ typedef struct GrantStmt
 								 * or plain names (as Value strings) */
 	List	   *privileges;		/* list of AccessPriv nodes */
 	/* privileges == NIL denotes ALL PRIVILEGES */
-	List	   *grantees;		/* list of PrivGrantee nodes */
+	List	   *grantees;		/* list of RoleSpec nodes */
 	bool		grant_option;	/* grant or revoke grant option */
 	DropBehavior behavior;		/* drop behavior (for REVOKE) */
 } GrantStmt;
 
-typedef struct PrivGrantee
-{
-	NodeTag		type;
-	char	   *rolname;		/* if NULL then PUBLIC */
-} PrivGrantee;
-
 /*
  * Note: FuncWithArgs carries only the types of the input parameters of the
  * function.  So it is sufficient to identify an existing function, but it
@@ -1487,7 +1501,7 @@ typedef struct GrantRoleStmt
 	List	   *grantee_roles;	/* list of member roles to add/delete */
 	bool		is_grant;		/* true = GRANT, false = REVOKE */
 	bool		admin_opt;		/* with admin option */
-	char	   *grantor;		/* set grantor to other than current role */
+	Node	   *grantor;		/* set grantor to other than current role */
 	DropBehavior behavior;		/* drop behavior (for REVOKE) */
 } GrantRoleStmt;
 
@@ -1699,7 +1713,7 @@ typedef struct CreateTableSpaceStmt
 {
 	NodeTag		type;
 	char	   *tablespacename;
-	char	   *owner;
+	Node	   *owner;
 	char	   *location;
 	List	   *options;
 } CreateTableSpaceStmt;
@@ -1825,7 +1839,7 @@ typedef struct CreateForeignTableStmt
 typedef struct CreateUserMappingStmt
 {
 	NodeTag		type;
-	char	   *username;		/* username or PUBLIC/CURRENT_USER */
+	Node	   *user;			/* user role */
 	char	   *servername;		/* server name */
 	List	   *options;		/* generic options to server */
 } CreateUserMappingStmt;
@@ -1833,7 +1847,7 @@ typedef struct CreateUserMappingStmt
 typedef struct AlterUserMappingStmt
 {
 	NodeTag		type;
-	char	   *username;		/* username or PUBLIC/CURRENT_USER */
+	Node	   *user;			/* user role */
 	char	   *servername;		/* server name */
 	List	   *options;		/* generic options to server */
 } AlterUserMappingStmt;
@@ -1841,7 +1855,7 @@ typedef struct AlterUserMappingStmt
 typedef struct DropUserMappingStmt
 {
 	NodeTag		type;
-	char	   *username;		/* username or PUBLIC/CURRENT_USER */
+	Node	   *user;			/* user role */
 	char	   *servername;		/* server name */
 	bool		missing_ok;		/* ignore missing mappings */
 } DropUserMappingStmt;
@@ -1991,7 +2005,7 @@ typedef struct CreateRoleStmt
 typedef struct AlterRoleStmt
 {
 	NodeTag		type;
-	char	   *role;			/* role name */
+	Node	   *role;			/* role */
 	List	   *options;		/* List of DefElem nodes */
 	int			action;			/* +1 = add members, -1 = drop members */
 } AlterRoleStmt;
@@ -1999,7 +2013,7 @@ typedef struct AlterRoleStmt
 typedef struct AlterRoleSetStmt
 {
 	NodeTag		type;
-	char	   *role;			/* role name */
+	Node	   *role;			/* role */
 	char	   *database;		/* database name, or NULL */
 	VariableSetStmt *setstmt;	/* SET or RESET subcommand */
 } AlterRoleSetStmt;
@@ -2375,7 +2389,7 @@ typedef struct AlterOwnerStmt
 	RangeVar   *relation;		/* in case it's a table */
 	List	   *object;			/* in case it's some other object */
 	List	   *objarg;			/* argument types, if applicable */
-	char	   *newowner;		/* the new owner */
+	Node	   *newowner;		/* the new owner */
 } AlterOwnerStmt;
 
 
@@ -2831,7 +2845,7 @@ typedef struct ReassignOwnedStmt
 {
 	NodeTag		type;
 	List	   *roles;
-	char	   *newrole;
+	Node	   *newrole;
 } ReassignOwnedStmt;
 
 /*
diff --git a/src/include/utils/acl.h b/src/include/utils/acl.h
index ab0df6c..35f8853 100644
--- a/src/include/utils/acl.h
+++ b/src/include/utils/acl.h
@@ -24,6 +24,7 @@
 #ifndef ACL_H
 #define ACL_H
 
+#include "access/htup.h"
 #include "nodes/parsenodes.h"
 #include "utils/array.h"
 #include "utils/snapshot.h"
@@ -227,8 +228,10 @@ extern bool is_member_of_role(Oid member, Oid role);
 extern bool is_member_of_role_nosuper(Oid member, Oid role);
 extern bool is_admin_of_role(Oid member, Oid role);
 extern void check_is_member_of_role(Oid member, Oid role);
-extern Oid	get_role_oid(const char *rolname, bool missing_ok);
-extern Oid	get_role_oid_or_public(const char *rolname);
+extern Oid	get_role_oid(const char *rolename, bool missing_ok);
+extern Oid	get_role_oid_or_public(const char *rolename);
+extern Oid  get_rolespec_oid(const Node *node, bool missing_ok);
+extern HeapTuple get_rolespec_tuple(const Node *node);
 
 extern void select_best_grantor(Oid roleId, AclMode privileges,
 					const Acl *acl, Oid ownerId,
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index e0ae2f2..6d3b865 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -59,7 +59,7 @@ test: create_index create_view
 # ----------
 # Another group of parallel tests
 # ----------
-test: create_aggregate create_function_3 create_cast constraints triggers inherit create_table_like typed_table vacuum drop_if_exists updatable_views
+test: create_aggregate create_function_3 create_cast constraints triggers inherit create_table_like typed_table vacuum drop_if_exists updatable_views rolenames
 
 # ----------
 # sanity_check does a vacuum, affecting the sort order of SELECT *
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 7f762bd..8326894 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -71,6 +71,7 @@ test: typed_table
 test: vacuum
 test: drop_if_exists
 test: updatable_views
+test: rolenames
 test: sanity_check
 test: errors
 test: select
-- 
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