Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Updated TODO:
> * Allow the creation of bitmap indexes which can be quickly combined
> with other bitmap indexes
This TODO item description is fundamentally misleading.
The point was *not* about making "bitmap indexes", which on its face
suggests a persistent on-disk data structure comparable to our existing
index types. The point was about using transient in-memory bitmaps as
an interface between the on-disk indexes and accessing the table proper.
regards, tom lane