On 12/29/21 5:07 AM, Chris Cleveland wrote:
I'm developing a new index access method. Sometimes the planner uses it
and sometimes it doesn't. I'm trying to debug the process to understand
why the index does or doesn't get picked up.
Is there a way to dump all of the query plans that the planner
considered, along with information on why they were rejected? EXPLAIN
only gives info on the plan that was actually selected.
You can enable OPTIMIZER_DEBUG option. Also the gdbpg code [1] makes our
work much easier, sometimes.
[1] https://github.com/tvondra/gdbpg
--
regards,
Andrey Lepikhov
Postgres Professional
