"As a workaround/test, you could maybe add an expression index
ON( (vw2.product_group_name ||'.'|| vw2.product_node_name) )"

Unfortunately, vw2 is a view, but I had a similar thought.  I'm looking
into splitting i.product-node_name into separate columns though, thanks!


On Thu, Sep 27, 2018 at 3:33 PM Justin Pryzby <pry...@telsasoft.com> wrote:

> On Thu, Sep 27, 2018 at 03:37:57PM -0400, Arjun Ranade wrote:
> > Yes, that join is concerning (red text below).  The conditions all need
> to
> > be checked so they are independent.
>
> You can play with the join conditions to see which test is getting such a
> bad
> estimate, or if it's a combination of tests (as I suspected) giving a bad
> estimate.
>
> There's a good chance this one isn't doing very well:
>
> >    vw2.product_group_name ||'.'|| vw2.product_node_name =
> i.product_node_name
>
> As a workaround/test, you could maybe add an expression index
> ON( (vw2.product_group_name ||'.'|| vw2.product_node_name) )
>
> ..and then ANALYZE.  Eventually, you'd want to consider splitting
> i.product_node_name into separate columns.
>
> Justin
>

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