Wow Michael you are absolutely right. Turning jit off results in a query
execution about twice as fast as pg11. That is a huge relief. I will read
the jit related docs and see if there is anything smarter I should be doing
other than disabling jit entirely, but it works a treat for this query.
>
> Does anyone have a theory of why pg15 should behave so differently to pg11
> here? Better still, any suggestions for configuration that might make pg15
> behave more like pg10. I am really dreading the prospect of stepping our
> many live implementations back to pg11 :-(.
>
One major factor
