On Tue, Oct 27, 2020 at 11:06:22AM -0300, Fabrízio de Royes Mello wrote: > When we create a new table or index they will not have statistics until an > ANALYZE happens. This is the default behaviour and I think is not a big > problem here, but we need to add some note on docs about the need of > statistics for indexes on expressions. > > But IMHO there is a misbehaviour with the implementation of CONCURRENTLY on > REINDEX because running it will lose the statistics. Have a look the > example below: > > [...] > > So IMHO here is the place we should rework a bit to execute ANALYZE as a > last step.
I agree that this is not user-friendly, and I suspect that we will need to do something within index_concurrently_swap() to fill in the stats of the new index from the data of the old one (not looked at that in details yet). -- Michael
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