Fix unexpected error messages for various flavors of ALTER TABLE

Some commands of ALTER TABLE could fail with the following error:
ERROR:  "tab" is of the wrong type

This error is unexpected, as all the code paths leading to
ATWrongRelkindError() should use a supported set of relkinds to generate
correct error messages.  This commit closes the gap with such mistakes,
by adding all the missing relkind combinations.  Tests are added to
check all the problems found.  Note that some combinations are not used,
but these are left around as it could have an impact on applications
relying on this code.

2ed532e has done a much larger refactoring on HEAD to make such error
messages easier to manage in the long-term, so nothing is needed there.

Author: Kyotaro Horiguchi
Reviewed-by: Peter Eisentraut, Ahsan Hadi, Michael Paquier
Discussion: https://postgr.es/m/20210216.181415.368926598204753659.horikyota.ntt@gmail.com
Backpatch-through: 11

src/backend/commands/tablecmds.c

@@ -5372,6 +5372,9 @@ ATWrongRelkindError(Relation rel, int allowed_targets)
 		case ATT_TABLE | ATT_MATVIEW | ATT_INDEX:
 			msg = _("\"%s\" is not a table, materialized view, or index");
 			break;
+		case ATT_TABLE | ATT_MATVIEW | ATT_INDEX | ATT_PARTITIONED_INDEX:
+			msg = _("\"%s\" is not a table, materialized view, index, or partitioned index");
+			break;
 		case ATT_TABLE | ATT_MATVIEW | ATT_FOREIGN_TABLE:
 			msg = _("\"%s\" is not a table, materialized view, or foreign table");
 			break;
@@ -5384,6 +5387,9 @@ ATWrongRelkindError(Relation rel, int allowed_targets)
 		case ATT_TABLE | ATT_MATVIEW | ATT_INDEX | ATT_FOREIGN_TABLE:
 			msg = _("\"%s\" is not a table, materialized view, index, or foreign table");
 			break;
+		case ATT_TABLE | ATT_PARTITIONED_INDEX:
+			msg = _("\"%s\" is not a table or partitioned index");
+			break;
 		case ATT_VIEW:
 			msg = _("\"%s\" is not a view");
 			break;

src/test/regress/expected/alter_table.out

@@ -3948,6 +3948,11 @@ ERROR:  remainder for hash partition must be less than modulus
 ALTER TABLE hash_parted ATTACH PARTITION fail_part FOR VALUES WITH (MODULUS 3, REMAINDER 2);
 ERROR:  every hash partition modulus must be a factor of the next larger modulus
 DROP TABLE fail_part;
+-- fails with incorrect object type
+CREATE VIEW at_v1 AS SELECT 1 as a;
+ALTER TABLE at_v1 ATTACH PARTITION dummy default;
+ERROR:  "at_v1" is not a partitioned table or index
+DROP VIEW at_v1;
 --
 -- DETACH PARTITION
 --

src/test/regress/expected/foreign_data.out

@@ -880,6 +880,8 @@ ALTER FOREIGN TABLE ft1 DROP COLUMN c9;
 ALTER FOREIGN TABLE ft1 SET SCHEMA foreign_schema;
 ALTER FOREIGN TABLE ft1 SET TABLESPACE ts;                      -- ERROR
 ERROR:  relation "ft1" does not exist
+ALTER FOREIGN TABLE foreign_schema.ft1 SET TABLESPACE ts;       -- ERROR
+ERROR:  "ft1" is not a table, materialized view, index, or partitioned index
 ALTER FOREIGN TABLE foreign_schema.ft1 RENAME c1 TO foreign_column_1;
 ALTER FOREIGN TABLE foreign_schema.ft1 RENAME TO foreign_table_1;
 \d foreign_schema.foreign_table_1

src/test/regress/sql/alter_table.sql

@@ -2593,6 +2593,11 @@ ALTER TABLE hash_parted ATTACH PARTITION fail_part FOR VALUES WITH (MODULUS 8, R
 ALTER TABLE hash_parted ATTACH PARTITION fail_part FOR VALUES WITH (MODULUS 3, REMAINDER 2);
 DROP TABLE fail_part;
 
+-- fails with incorrect object type
+CREATE VIEW at_v1 AS SELECT 1 as a;
+ALTER TABLE at_v1 ATTACH PARTITION dummy default;
+DROP VIEW at_v1;
+
 --
 -- DETACH PARTITION
 --

src/test/regress/sql/foreign_data.sql

@@ -408,6 +408,7 @@ ALTER FOREIGN TABLE ft1 DROP COLUMN IF EXISTS no_column;
 ALTER FOREIGN TABLE ft1 DROP COLUMN c9;
 ALTER FOREIGN TABLE ft1 SET SCHEMA foreign_schema;
 ALTER FOREIGN TABLE ft1 SET TABLESPACE ts;                      -- ERROR
+ALTER FOREIGN TABLE foreign_schema.ft1 SET TABLESPACE ts;       -- ERROR
 ALTER FOREIGN TABLE foreign_schema.ft1 RENAME c1 TO foreign_column_1;
 ALTER FOREIGN TABLE foreign_schema.ft1 RENAME TO foreign_table_1;
 \d foreign_schema.foreign_table_1