I've been working on bitmap index AM for some time.

The situation is --- in general it works, but there're some problems I cannot
fix myself. I've been using Teodor's scripts for concurrency tests (modified a
bit), unfortunately without success.

Anyway, here's the patch. I hope someone will look at it and comment it.

Some notes:
-  I haven't tested amrkpos and restrpos functions, don't know how (I've been
   trying to make planner choose merge join without luck);
-  no space is freed during vacuums, I think I'll elaborate on this in
   separate email;
-  nothing done around cost estimation.

Waiting for feedback, thanks.


Victor Y. Yegorov

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