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3 commits

Author SHA1 Message Date
Tom Lane
46a0eee300 Tweak nodeBitmapAnd to stop evaluating sub-plan scans if it finds it's 
got an empty bitmap after any step; the remaining subplans can no longer
affect the result.  Per a suggestion from Ilia Kantor.
 2005-08-28 22:47:20 +00:00
Tom Lane
9d64632144 Minor performance improvement: avoid unnecessary creation/unioning of 
bitmaps for multiple indexscans.  Instead just let each indexscan add
TIDs directly into the BitmapOr node's result bitmap.
 2005-04-20 15:48:36 +00:00
Tom Lane
4a8c5d0375 Create executor and planner-backend support for decoupled heap and index 
scans, using in-memory tuple ID bitmaps as the intermediary.  The planner
frontend (path creation and cost estimation) is not there yet, so none
of this code can be executed.  I have tested it using some hacked planner
code that is far too ugly to see the light of day, however.  Committing
now so that the bulk of the infrastructure changes go in before the tree
drifts under me.
 2005-04-19 22:35:18 +00:00