Hi Amir,
Amir Dror wrote:
Hi Jody,
The performance with this join and without it has enormous change so even without viso plan I'm sure that this join is done.
I'd recommend you investigate this further. For example, constraint filters on the right table will force join execution even if no fields from the right table are queried. Generally speaking though the join won't execute if fields aren't requested from the right table in the case of Left Outer Join and Referential Join. (For Left Outer, the key field can be included without worry about join execution. Referential, however, will execute the join when the key field is included).
You can test this yourself by building a simple model with a Left Outer (or Referential also, in the case of Analytic Views) join, executing a query only against fields from the left table, and looking at the VizPlan result.
What does related attributes means?\
Not a clue. 