Dropping a custom data type used as partition key cause problems

[eaydingol]

It is possible to drop a data type that is used as a distribution key by citus.
However, as the datatype is still stored by citus, querying the corresponding table and citus_table fails,
See the logs below.
A possible solution is to avoid dropping a data when it is used as a distribution key. An alternative would be propagating the drop operation to citus internal tables (need further analysis)

ebru=# create type my_type AS (d1 int, d2 int);
CREATE TYPE
ebru=# create table test_table(data my_type, id int);
CREATE TABLE
ebru=# select create_distributed_table('test_table', 'data');
 create_distributed_table
--------------------------

(1 row)

ebru=#
ebru=# drop type my_type ;
ERROR:  cannot drop type my_type because other objects depend on it
DETAIL:  column data of table test_table depends on type my_type
HINT:  Use DROP ... CASCADE to drop the dependent objects too.
ebru=# drop type my_type cascade;
NOTICE:  drop cascades to column data of table test_table
DROP TYPE
ebru=#
ebru=# select * from test_table ;
ERROR:  cache lookup failed for type 17275
ebru=# select * from citus_tables ;
ERROR:  cache lookup failed for type 17275
ebru=#
ebru=# select * from pg_dist_colocation;
 colocationid | shardcount | replicationfactor | distributioncolumntype | distributioncolumncollation
--------------+------------+-------------------+------------------------+-----------------------------
            1 |         32 |                 1 |                  17275 |                           0
            2 |         32 |                 1 |                     23 |                           0
(2 rows)

[onurctirtir]

Same as #6392, so I'm closing this one.