Re: Unexpected planner choice in simple JOIN

[Mark Kirkwood]

I don't think so - while the case I posted used a hash index on the 
child table, exactly the sane behaviour happens if it is a btree (I 
probably should have mentioned that sorry). Background is I discovered 
this while playing about with hash indexes...which I must say - someone 
has done excellent work on as in this *particular cases* they are 
getting me better query performance!

regards
Mark

On 08/01/2026 16:56, David Rowley wrote:
On Thu, 8 Jan 2026 at 16:34, Mark Kirkwood <mark.kirkw...@gmail.com> wrote:
This does seem to be related to parallel planning:
Isn't it just a case of hash indexes not allowing parallel scans?

David