"Victor Y. Yegorov" <[EMAIL PROTECTED]> writes:
> I have questions on how to implement on-disk bitmap scan.
I think your best plan might be
1. Be sure that all the indexable WHERE conditions are passed to the
indexscan as indexquals. This might be, say,
WHERE a = 42 and b = 'foo'
2. Within the index AM, form the AND of the relevant bitmaps (here the
ones for a = 42 and b = 'foo').
3. Within the index AM, pick up the TIDs for the remaining one-bits,
and pass them back.
4. Let the existing machinery handle the OR-ing problem as well as
actual fetching of the heap rows.
This can be done without any restructuring of the index AM API.
regards, tom lane
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