On Jan 10, 2013, at 2:16 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> Is there some way to only get the relevant index expression from indexprs, rather than the whole expression?
>
> pg_get_indexdef() is your friend. You really, really don't want to
> write any client-side code that inspects indexprs directly. It'll
> break.
Ah-hah, somehow I missed that. So this:
SELECT s.i, pg_catalog.pg_get_indexdef( ci.oid, s.i+1, false) FROM pg_catalog.pg_index x JOIN
pg_catalog.pg_classct ON ct.oid = x.indrelid JOIN pg_catalog.pg_class ci ON ci.oid = x.indexrelid
JOINpg_catalog.pg_namespace n ON n.oid = ct.relnamespace JOIN generate_series(0,
current_setting('max_index_keys')::int- 1) s(i) ON x.indkey[s.i] IS NOT NULL WHERE ct.relname = 'foo'
AND ci.relname = 'idx_foo_stuff' AND n.nspname = 'public' ORDER BY s.i
Returns:
i | pg_get_indexdef
---+-----------------0 | id1 | abs(id)2 | (bar_ids[1])
Which is perfect. Thanks!
David