On Wed, Apr 17, 2019 at 11:52:44PM -0400, Gunther wrote: > Hi guys. I don't want to be pushy, but I found it strange that after so much Were you able to reproduce the issue in some minimized way ? Like after joining fewer tables or changing to join with fewer join conditions ? On Thu, Apr 18, 2019 at 05:21:28PM +0200, Tomas Vondra wrote: > As for the issue - I think the current hypothesis is that the data > distribution is skewed in some strange way, triggering some unexpected > behavior in hash join. That seems plausible, but it's really hard to > investigate without knowing anything about the data distribution :-( > > It would be possible to do at least one of these two things: > > (a) export pg_stats info about distribution of the join keys For starts, could you send the MCVs, maybe with some variation on this query ? https://wiki.postgresql.org/wiki/Slow_Query_Questions#Statistics:_n_distinct.2C_MCV.2C_histogram Justin
