Re: simple function index question

From: pgsql-sql-owner(at)postgresql(dot)org [mailto:pgsql-sql-owner(at)postgresql(dot)org] On Behalf Of Michael Moore
Sent: Wednesday, March 23, 2016 11:14 AM
To: postgres list <pgsql-sql(at)postgresql(dot)org>
Subject: Re: [SQL] simple function index question

Thanks guys,
I agree that the data model is suspect. I'm trying to convert from Oracle to Postgres and changing table structures is not really an option for me. I tried casting the null, ... same problem. It does not like the undefined record type as David is saying. I will try his solution and let you know how it goes.

Interestingly a version of this:

CREATE INDEX TX_QSET_DIR_MAP_PRI_URI_TYP_UK
ON tx_question_set_dir_map
USING btree
(question_set2tx_question_set ,uri_type,
(CASE WHEN uri_type = 201900 THEN null::varchar(100)
ELSE question_set_dir_map_key END);

Worked for me. Try it if you are still interested.
Just do proper casting of null (it was varchar(100) in my case).

Regards,
Igor Neyman