Index file got removed

Hi,

Please look at a below sequence of SQL.

set default_tablespace to '';
create table test(id int primary key, processid bigint not null ,
ruleid bigint not null );
create index on test (ruleid );
create index on test (processid );
set default_tablespace to tblsp;
alter table test alter processid type bigint, alter processid drop
not null;

I am creating a table test and index for that table on default tablespace.
Then i'm changing default_tablespace to some other tablespace.
After that altering one of the index column.
This alter operation moves the index to new default_tablespace, but index
file is missing in new tablespace.
So we can not access the table.

----
db=# select * from test;
ERROR: could not open file "pg_tblspc/16703/PG_9.6_201608131/16385/16710":
No such file or directory

db=# \d+ test
Table "public.test"
Column | Type | Modifiers | Storage | Stats target | Description
-----------+---------+-----------+---------+--------------+-------------
id | integer | not null | plain | |
processid | bigint | | plain | |
ruleid | bigint | not null | plain | |
Indexes:
"test_pkey" PRIMARY KEY, btree (id)
"test_processid_idx" btree (processid), tablespace "tblsp"
"test_ruleid_idx" btree (ruleid)

---

I tried it on 9.5.1 & 9.6.0, index got missed in both version.

-sudalai

-----
sudalai
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