(partial?) indexes, LIKE and NULL

Hi,

with the following table:

    Table "public.foo"
 Column | Type | Modifiers
--------+------+-----------
 t      | text |
Indexes:
     "a" btree (t)

Shouldn't queries that use
   ... where t like '%something%'

benefit from "a" when t is NULL in almost all cases, since the query 
planner could use "a" to access the few non-NULL rows quickly? It 
doesn't seem to work right now.

(I assume that it would make no difference if the index "a" was partial, 
excluding NULLs)

Regards,
-mjy


---------------------------(end of broadcast)---------------------------
TIP 8: explain analyze is your friend