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