Add more checks against altering typed tables

- Prohibit altering column type
- Prohibit changing inheritance
- Move checks from Exec to Prep phases in ALTER TABLE code

backpatched to 9.0

2 files changed, 13 insertions, 0 deletions

diff --git a/src/test/regress/expected/typed_table.out b/src/test/regress/expected/typed_table.out
index e92cdf65e1f..9b933fdadcb 100644
--- a/src/test/regress/expected/typed_table.out
+++ b/src/test/regress/expected/typed_table.out
@@ -25,12 +25,18 @@ SELECT * FROM get_all_persons();
 ----+------
 (0 rows)
 
+-- certain ALTER TABLE operations on typed tables are not allowed
 ALTER TABLE persons ADD COLUMN comment text;
 ERROR:  cannot add column to typed table
 ALTER TABLE persons DROP COLUMN name;
 ERROR:  cannot drop column from typed table
 ALTER TABLE persons RENAME COLUMN id TO num;
 ERROR:  cannot rename column of typed table
+ALTER TABLE persons ALTER COLUMN name TYPE varchar;
+ERROR:  cannot alter column type of typed table
+CREATE TABLE stuff (id int);
+ALTER TABLE persons INHERIT stuff;
+ERROR:  cannot change inheritance of typed table
 CREATE TABLE personsx OF person_type (myname WITH OPTIONS NOT NULL); -- error
 ERROR:  column "myname" does not exist
 CREATE TABLE persons2 OF person_type (
@@ -83,3 +89,4 @@ DETAIL:  drop cascades to table persons
 drop cascades to function get_all_persons()
 drop cascades to table persons2
 drop cascades to table persons3
+DROP TABLE stuff;
diff --git a/src/test/regress/sql/typed_table.sql b/src/test/regress/sql/typed_table.sql
index 4e81f1dd6a4..60cb6d6857e 100644
--- a/src/test/regress/sql/typed_table.sql
+++ b/src/test/regress/sql/typed_table.sql
@@ -13,9 +13,13 @@ $$;
 
 SELECT * FROM get_all_persons();
 
+-- certain ALTER TABLE operations on typed tables are not allowed
 ALTER TABLE persons ADD COLUMN comment text;
 ALTER TABLE persons DROP COLUMN name;
 ALTER TABLE persons RENAME COLUMN id TO num;
+ALTER TABLE persons ALTER COLUMN name TYPE varchar;
+CREATE TABLE stuff (id int);
+ALTER TABLE persons INHERIT stuff;
 
 CREATE TABLE personsx OF person_type (myname WITH OPTIONS NOT NULL); -- error
 
@@ -40,3 +44,5 @@ CREATE TABLE persons4 OF person_type (
 
 DROP TYPE person_type RESTRICT;
 DROP TYPE person_type CASCADE;
+
+DROP TABLE stuff;