The docs for Pg's Window function say:

The rows considered by a window function are those of the "virtual table" produced by the query's FROM clause as filtered by its WHERE, GROUP BY, and HAVING clauses if any. For example, a row removed because it does not meet the WHERE condition is not seen by any window function. A query can contain multiple window functions that slice up the data in different ways by means of different OVER clauses, but they all act on the same collection of rows defined by this virtual table.

However, I'm not seeing this. It seems to me like the Select Filter is very near to the left margin and the top (last thing done).

=# EXPLAIN SELECT * FROM chrome_nvd.view_options where fkey_style = 303451;
                                                      QUERY PLAN                                                      
----------------------------------------------------------------------------------------------------------------------
 Subquery Scan view_options  (cost=2098450.26..2142926.28 rows=14825 width=180)
   Filter: (view_options.fkey_style = 303451)
   ->  Sort  (cost=2098450.26..2105862.93 rows=2965068 width=189)
         Sort Key: o.sequence
         ->  WindowAgg  (cost=1446776.02..1506077.38 rows=2965068 width=189)
               ->  Sort  (cost=1446776.02..1454188.69 rows=2965068 width=189)
                     Sort Key: h.name, k.name
                     ->  WindowAgg  (cost=802514.45..854403.14 rows=2965068 width=189)
                           ->  Sort  (cost=802514.45..809927.12 rows=2965068 width=189)
                                 Sort Key: h.name
                                 ->  Hash Join  (cost=18.52..210141.57 rows=2965068 width=189)
                                       Hash Cond: (o.fkey_opt_header = h.id)
postgresql where-clause window-functions
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