FARRAGO - fixed a defect found while running the testcase for LDB-61; if        a factor is pushed down, the topmost filter may also need to be adjusted        to reflect swapping of the children within the subtree where the new        factor was pushed down
FARRAGO - fixed a defect found while running the testcase for LDB-61; if
       a factor is pushed down, the topmost filter may also need to be adjusted
       to reflect swapping of the children within the subtree where the new
       factor was pushed down

[git-p4: depot-paths = "//open/lu/dev/": change = 6258]

LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb,LucidDB/luciddb