The following bug has been logged online:
Bug reference: 5000
Logged by: Brian Ceccarelli
Email address: ceccareb(at)talusmusic(dot)com
PostgreSQL version: 8.2.13
Operating system: Linux
Description: Optimizer does not use function-based index for an order
Subject line says it all.
I have a function-based index on a large table.
order by (f_squash_descr(descr::text))
create unique index net32_product_def_text_idx on net32_product_def (
The explain plan says that Postgres always does a table scan instead of
using the index. The table is 500,000 rows long, and the function
f_squash_descr() is a CPU-instensive operation. What should come
instantly, takes 1 minute.
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|Next:||From: Greg Stark||Date: 2009-08-20 21:54:56|
|Subject: Re: BUG #5000: Optimizer does not use function-based index for an order by|
|Previous:||From: Brian Ceccarelli||Date: 2009-08-20 20:24:53|
|Subject: BUG #4999: select 'a' < 'A' is true, but should be false . . .|