Hello,
I am running into performance issues with large CTE "WITH" queries (just
for selecting, not updating). I was surprised to find that the queries
run much faster if I convert the CTEs to subqueries. From googling, I
see that this is due to CTE acting as an optimization fence in PG.
Unfortunately due to the application I'm dealing with, converting all
CTE queries to subquery model is not feasible. Plus, the readability of
CTE is a big bonus.
I see there was some discussion last year about removing the CTE
optimization fence (e.g.
http://www.postgresql-archive.org/CTE-inlining-td5958992.html) but can't
find anything more recent. Does anyone know if this is still under
consideration? For what it's worth, I would love some way to make CTEs
inlined/optimized.
Thank you very much to the developers for a truly amazing database system.
Thanks
Guy
