David G Johnston <david.g.johns...@gmail.com> writes:
> Benedikt Grundmann wrote
>> That is it possible to tell the planner that index is off limits i.e.
>> don't ever generate a plan using it?

> Catalog hacking could work but not recommended (nor do I know the proper
> commands and limitations).  Do you need the database/table to accept writes
> during the testing period?

Hacking pg_index.indisvalid could work, given a reasonably recent PG.
I would not try it in production until I'd tested it ;-)

                        regards, tom lane

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