Re: BUG #5702: pg fails to use a conditional index even the where clause matches the condition

"Corin" <info@netskin.com> writes:
> CREATE INDEX fanobjects_amazon_product_id_index
>   ON fanobjects
>   USING btree
>   (amazon_product_id)
>   WHERE NOT amazon_product_id IS NULL;

Try it like

    WHERE amazon_product_id IS NOT NULL;

> I'd consider this a bug as "NOT x IS NULL" is the same as "x IS NOT NULL".

We don't expend an infinite number of cycles on rewriting different
query formulations into each other, and that's one of the ones we
don't handle ...

            regards, tom lane