Filtered index condition is ignored by optimizer

Question

Assume I\'m running a website that shows funny cat pictures. I have a table called CatPictures with the columns Filename, Awesomeness,

Answer 1

No, not currently.

See this connect item. It is Closed as Won't Fix. (Or this one for the IS NULL case specifically)

The connect item does provide a workaround shown below.

Posted by RichardB CFCU on 29/09/2011 at 9:15 AM

A workaround is to INCLUDE the column that is being filtered on.

Example:

CREATE NONCLUSTERED INDEX [idx_FilteredKey1] ON [dbo].[TABLE] 
(
    [TABLE_ID] ASC,
    [TABLE_ID2] ASC
)
INCLUDE ( [REMOVAL_TIMESTAMP]) --explicitly include the column here
WHERE ([REMOVAL_TIMESTAMP] IS NULL)