"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 <pryzby@xxxxxxxxxxxxx> 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
