8.5devel: alter constraint ?

Hi,

I'm playing with 8.5devel.

My question: is it possible to alter a constraint without drop and
rebuilding it?

For instance, i have a table test with a primary key, but i have
forgotten to declare the constraint as DEFERRABLE. I can drop and
recreate that, but the index are also dropped and recreated and i think,
this is not necessary.

test=# \d test
Table "public.test"
Column │ Type │ Modifiers
────────┼─────────┼───────────
i │ integer │ not null
Indexes:
"test_pkey" PRIMARY KEY, btree (i)

test=# alter table test drop constraint test_pkey ;
ALTER TABLE
Time: 1,127 ms
test=*# alter table test add primary key (i) DEFERRABLE INITIALLY DEFERRED;
NOTICE: ALTER TABLE / ADD PRIMARY KEY will create implicit index "test_pkey" for table "test"
ALTER TABLE
Time: 281,479 ms
test=*# \d test
Table "public.test"
Column │ Type │ Modifiers
────────┼─────────┼───────────
i │ integer │ not null
Indexes:
"test_pkey" PRIMARY KEY, btree (i) DEFERRABLE INITIALLY DEFERRED

Andreas
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