Remove ATT_TABLE for ALTER TABLE ... ATTACH/DETACH

Attempting these commands for a non-partitioned table would result in a
failure when creating the relation in transformPartitionCmd().  This
gives the possibility to throw an error earlier with a much better error
message, thanks to d69a3f4d70.

The extra test cases are from me.  Note that FINALIZE uses a different
subcommand and it had no coverage for its failure path with
non-partitioned tables.

Author: Álvaro Herrera, Michael Paquier
Reviewed-by: Nathan Bossart
Discussion: https://postgr.es/m/202409190803.tnis52adt2n5@alvherre.pgsql

src/backend/commands/tablecmds.c

@@ -5107,19 +5107,17 @@ ATPrepCmd(List **wqueue, Relation rel, AlterTableCmd *cmd,
 			break;
 		case AT_AttachPartition:
 			ATSimplePermissions(cmd->subtype, rel,
-								ATT_TABLE | ATT_PARTITIONED_TABLE | ATT_PARTITIONED_INDEX);
+								ATT_PARTITIONED_TABLE | ATT_PARTITIONED_INDEX);
 			/* No command-specific prep needed */
 			pass = AT_PASS_MISC;
 			break;
 		case AT_DetachPartition:
-			ATSimplePermissions(cmd->subtype, rel,
-								ATT_TABLE | ATT_PARTITIONED_TABLE);
+			ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
 			/* No command-specific prep needed */
 			pass = AT_PASS_MISC;
 			break;
 		case AT_DetachPartitionFinalize:
-			ATSimplePermissions(cmd->subtype, rel,
-								ATT_TABLE | ATT_PARTITIONED_TABLE);
+			ATSimplePermissions(cmd->subtype, rel, ATT_PARTITIONED_TABLE);
 			/* No command-specific prep needed */
 			pass = AT_PASS_MISC;
 			break;

src/test/regress/expected/alter_table.out

@@ -3911,7 +3911,8 @@ CREATE TABLE unparted (
 );
 CREATE TABLE fail_part (like unparted);
 ALTER TABLE unparted ATTACH PARTITION fail_part FOR VALUES IN ('a');
-ERROR:  table "unparted" is not partitioned
+ERROR:  ALTER action ATTACH PARTITION cannot be performed on relation "unparted"
+DETAIL:  This operation is not supported for tables.
 DROP TABLE unparted, fail_part;
 -- check that partition bound is compatible
 CREATE TABLE list_parted (
@@ -4281,7 +4282,14 @@ DROP TABLE fail_part;
 -- check that the table is partitioned at all
 CREATE TABLE regular_table (a int);
 ALTER TABLE regular_table DETACH PARTITION any_name;
-ERROR:  table "regular_table" is not partitioned
+ERROR:  ALTER action DETACH PARTITION cannot be performed on relation "regular_table"
+DETAIL:  This operation is not supported for tables.
+ALTER TABLE regular_table DETACH PARTITION any_name CONCURRENTLY;
+ERROR:  ALTER action DETACH PARTITION cannot be performed on relation "regular_table"
+DETAIL:  This operation is not supported for tables.
+ALTER TABLE regular_table DETACH PARTITION any_name FINALIZE;
+ERROR:  ALTER action DETACH PARTITION ... FINALIZE cannot be performed on relation "regular_table"
+DETAIL:  This operation is not supported for tables.
 DROP TABLE regular_table;
 -- check that the partition being detached exists at all
 ALTER TABLE list_parted2 DETACH PARTITION part_4;

src/test/regress/sql/alter_table.sql

@@ -2742,6 +2742,8 @@ DROP TABLE fail_part;
 -- check that the table is partitioned at all
 CREATE TABLE regular_table (a int);
 ALTER TABLE regular_table DETACH PARTITION any_name;
+ALTER TABLE regular_table DETACH PARTITION any_name CONCURRENTLY;
+ALTER TABLE regular_table DETACH PARTITION any_name FINALIZE;
 DROP TABLE regular_table;
 
 -- check that the partition being detached exists at all