Further unify ROLE and USER command grammar rules

ALTER USER ... SET did not support all the syntax variants of ALTER ROLE
...  SET.  Fix that, and to avoid further deviations of this kind, unify
many the grammar rules for ROLE/USER/GROUP commands.

Reported-by: Pavel Golub <pavel@microolap.com>

doc/src/sgml/ref/alter_user.sgml

@@ -38,10 +38,10 @@ ALTER USER <replaceable class="PARAMETER">role_specification</replaceable> [ WIT
 
 ALTER USER <replaceable class="PARAMETER">name</replaceable> RENAME TO <replaceable>new_name</replaceable>
 
-ALTER USER <replaceable class="PARAMETER">role_specification</replaceable> SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
+ALTER USER { <replaceable class="PARAMETER">role_specification</replaceable> | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] SET <replaceable>configuration_parameter</replaceable> { TO | = } { <replaceable>value</replaceable> | DEFAULT }
-ALTER USER <replaceable class="PARAMETER">role_specification</replaceable> SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
+ALTER USER { <replaceable class="PARAMETER">role_specification</replaceable> | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] SET <replaceable>configuration_parameter</replaceable> FROM CURRENT
-ALTER USER <replaceable class="PARAMETER">role_specification</replaceable> RESET <replaceable>configuration_parameter</replaceable>
+ALTER USER { <replaceable class="PARAMETER">role_specification</replaceable> | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] RESET <replaceable>configuration_parameter</replaceable>
-ALTER USER <replaceable class="PARAMETER">role_specification</replaceable> RESET ALL
+ALTER USER { <replaceable class="PARAMETER">role_specification</replaceable> | ALL } [ IN DATABASE <replaceable class="PARAMETER">database_name</replaceable> ] RESET ALL
 
 <phrase>where <replaceable class="PARAMETER">role_specification</replaceable> can be:</phrase>
 

src/backend/parser/gram.y

@@ -250,7 +250,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 		AlterObjectDependsStmt AlterObjectSchemaStmt AlterOwnerStmt
 		AlterOperatorStmt AlterSeqStmt AlterSystemStmt AlterTableStmt
 		AlterTblSpcStmt AlterExtensionStmt AlterExtensionContentsStmt AlterForeignTableStmt
-		AlterCompositeTypeStmt AlterUserStmt AlterUserMappingStmt AlterUserSetStmt
+		AlterCompositeTypeStmt AlterUserMappingStmt
 		AlterRoleStmt AlterRoleSetStmt AlterPolicyStmt
 		AlterDefaultPrivilegesStmt DefACLAction
 		AnalyzeStmt ClosePortalStmt ClusterStmt CommentStmt
@@ -262,9 +262,9 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
 		CreateAssertStmt CreateTransformStmt CreateTrigStmt CreateEventTrigStmt
 		CreateUserStmt CreateUserMappingStmt CreateRoleStmt CreatePolicyStmt
 		CreatedbStmt DeclareCursorStmt DefineStmt DeleteStmt DiscardStmt DoStmt
-		DropGroupStmt DropOpClassStmt DropOpFamilyStmt DropPLangStmt DropStmt
+		DropOpClassStmt DropOpFamilyStmt DropPLangStmt DropStmt
 		DropAssertStmt DropCastStmt DropRoleStmt
-		DropUserStmt DropdbStmt DropTableSpaceStmt
+		DropdbStmt DropTableSpaceStmt
 		DropTransformStmt
 		DropUserMappingStmt ExplainStmt FetchStmt
 		GrantStmt GrantRoleStmt ImportForeignSchemaStmt IndexStmt InsertStmt
@@ -841,8 +841,6 @@ stmt :
 			| AlterTSConfigurationStmt
 			| AlterTSDictionaryStmt
 			| AlterUserMappingStmt
-			| AlterUserSetStmt
-			| AlterUserStmt
 			| AnalyzeStmt
 			| CheckPointStmt
 			| ClosePortalStmt
@@ -890,7 +888,6 @@ stmt :
 			| DoStmt
 			| DropAssertStmt
 			| DropCastStmt
-			| DropGroupStmt
 			| DropOpClassStmt
 			| DropOpFamilyStmt
 			| DropOwnedStmt
@@ -900,7 +897,6 @@ stmt :
 			| DropTableSpaceStmt
 			| DropTransformStmt
 			| DropRoleStmt
-			| DropUserStmt
 			| DropUserMappingStmt
 			| DropdbStmt
 			| ExecuteStmt
@@ -1130,6 +1126,14 @@ AlterRoleStmt:
 					n->options = $5;
 					$$ = (Node *)n;
 				 }
+			| ALTER USER RoleSpec opt_with AlterOptRoleList
+				 {
+					AlterRoleStmt *n = makeNode(AlterRoleStmt);
+					n->role = $3;
+					n->action = +1;	/* add, if there are members */
+					n->options = $5;
+					$$ = (Node *)n;
+				 }
 		;
 
 opt_in_database:
@@ -1154,37 +1158,23 @@ AlterRoleSetStmt:
 					n->setstmt = $5;
 					$$ = (Node *)n;
 				}
-		;
+			| ALTER USER RoleSpec opt_in_database SetResetClause
-
-
-/*****************************************************************************
- *
- * Alter a postgresql DBMS user
- *
- *****************************************************************************/
-
-AlterUserStmt:
-			ALTER USER RoleSpec opt_with AlterOptRoleList
-				 {
-					AlterRoleStmt *n = makeNode(AlterRoleStmt);
-					n->role = $3;
-					n->action = +1;	/* add, if there are members */
-					n->options = $5;
-					$$ = (Node *)n;
-				 }
-		;
-
-
-AlterUserSetStmt:
-			ALTER USER RoleSpec SetResetClause
 				{
 					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
 					n->role = $3;
-					n->database = NULL;
+					n->database = $4;
-					n->setstmt = $4;
+					n->setstmt = $5;
 					$$ = (Node *)n;
 				}
-			;
+			| ALTER USER ALL opt_in_database SetResetClause
+				{
+					AlterRoleSetStmt *n = makeNode(AlterRoleSetStmt);
+					n->role = NULL;
+					n->database = $4;
+					n->setstmt = $5;
+					$$ = (Node *)n;
+				}
+		;
 
 
 /*****************************************************************************
@@ -1211,17 +1201,7 @@ DropRoleStmt:
 					n->roles = $5;
 					$$ = (Node *)n;
 				}
-			;
+			| DROP USER role_list
-
-/*****************************************************************************
- *
- * Drop a postgresql DBMS user
- *
- * XXX As with DROP ROLE, no CASCADE/RESTRICT here.
- *****************************************************************************/
-
-DropUserStmt:
-			DROP USER role_list
 				{
 					DropRoleStmt *n = makeNode(DropRoleStmt);
 					n->missing_ok = FALSE;
@@ -1235,6 +1215,20 @@ DropUserStmt:
 					n->missing_ok = TRUE;
 					$$ = (Node *)n;
 				}
+			| DROP GROUP_P role_list
+				{
+					DropRoleStmt *n = makeNode(DropRoleStmt);
+					n->missing_ok = FALSE;
+					n->roles = $3;
+					$$ = (Node *)n;
+				}
+			| DROP GROUP_P IF_P EXISTS role_list
+				{
+					DropRoleStmt *n = makeNode(DropRoleStmt);
+					n->missing_ok = TRUE;
+					n->roles = $5;
+					$$ = (Node *)n;
+				}
 			;
 
 
@@ -1279,31 +1273,6 @@ add_drop:	ADD_P									{ $$ = +1; }
 		;
 
 
-/*****************************************************************************
- *
- * Drop a postgresql group
- *
- * XXX As with DROP ROLE, no CASCADE/RESTRICT here.
- *****************************************************************************/
-
-DropGroupStmt:
-			DROP GROUP_P role_list
-				{
-					DropRoleStmt *n = makeNode(DropRoleStmt);
-					n->missing_ok = FALSE;
-					n->roles = $3;
-					$$ = (Node *)n;
-				}
-			| DROP GROUP_P IF_P EXISTS role_list
-				{
-					DropRoleStmt *n = makeNode(DropRoleStmt);
-					n->missing_ok = TRUE;
-					n->roles = $5;
-					$$ = (Node *)n;
-				}
-		;
-
-
 /*****************************************************************************
  *
  * Manipulate a schema

src/test/regress/expected/rolenames.out

@@ -310,9 +310,9 @@ ERROR:  syntax error at or near "CURRENT_ROLE"
 LINE 1: ALTER USER CURRENT_ROLE WITH LOGIN;
                    ^
 ALTER USER ALL WITH REPLICATION; -- error
-ERROR:  syntax error at or near "ALL"
+ERROR:  syntax error at or near "WITH"
 LINE 1: ALTER USER ALL WITH REPLICATION;
-                   ^
+                       ^
 ALTER USER SESSION_ROLE WITH NOREPLICATION; -- error
 ERROR:  role "session_role" does not exist
 ALTER USER PUBLIC WITH NOREPLICATION; -- error
@@ -392,9 +392,6 @@ ALTER USER SESSION_USER SET application_name to 'BAR';
 ALTER USER "current_user" SET application_name to 'FOOFOO';
 ALTER USER "Public" SET application_name to 'BARBAR';
 ALTER USER ALL SET application_name to 'SLAP';
-ERROR:  syntax error at or near "ALL"
-LINE 1: ALTER USER ALL SET application_name to 'SLAP';
-                   ^
 SELECT * FROM chksetconfig();
  db  |       role       |  rolkeyword  |         setconfig         
 -----+------------------+--------------+---------------------------
@@ -419,9 +416,6 @@ ALTER USER SESSION_USER RESET application_name;
 ALTER USER "current_user" RESET application_name;
 ALTER USER "Public" RESET application_name;
 ALTER USER ALL RESET application_name;
-ERROR:  syntax error at or near "ALL"
-LINE 1: ALTER USER ALL RESET application_name;
-                   ^
 SELECT * FROM chksetconfig();
  db | role | rolkeyword | setconfig 
 ----+------+------------+-----------