Bug when changing datatype of primary key column

tested on:
1. 9.1.3
2. 9.3devel (yesterdays head in git)

steps to reproduce:

$ create table z (i int4);
CREATE TABLE

$ create unique index q on z (i);
CREATE INDEX

$ alter table z add primary key using index q;
ALTER TABLE

$ alter table z alter column i type int8;
ERROR:  could not open relation with OID 16503

looks like some missing dependancy.

Best regards,

depesz

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