Zhenghua Lyu writes:
> I run TPC-DS benchmark for Postgres and find the join size estimation has
> several problems.
> For example, Ndistinct is key to join selectivity's estimation, this
> value does not take restrictions
> of the rel, I hit some cases in the function eqjoinsel, nd
Hi,
I run TPC-DS benchmark for Postgres and find the join size estimation has
several problems.
For example, Ndistinct is key to join selectivity's estimation, this value
does not take restrictions
of the rel, I hit some cases in the function eqjoinsel, nd is much larger
than vardata
