Kyle Bateman <kyle@actarg.com> writes:
> I noticed that it seemed a bit slow to query
> information_schema.view_column_usage. As I look at the code in
> information_schema.sql, I'm not sure why pg_user is referenced twice
> (once without an alias). It looks like we can take out the first
> pg_user and remove the DISTINCT keyword and this improves the efficiency
> significantly.
The unconstrained join against pg_user is clearly unnecessary,
and in fact I took it out a few days ago. I'm not sure whether the
SELECT DISTINCT is still needed --- it might be, if there can be
multiple pg_depend entries linking the same entities.
Peter, any thoughts?
regards, tom lane
