PostgreSQL TODO List
====================
-Last updated: Sat Dec 17 13:06:57 EST 2005
+Last updated: Sat Dec 17 14:03:20 EST 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
* Log statements where the optimizer row estimates were dramatically
different from the number of rows actually found?
-* Allow star join optimizations
-
- While our bitmap scan allows multiple indexes to be joined to get
- to heap rows, a star joins allows multiple dimension _tables_ to
- be joined to index into a larger main fact table. The join is
- usually performed by either creating a cartesian product of all
- the dimmension tables and doing a single join on that product or
- using subselects to create bitmaps of each dimmension table match
- and merge the bitmaps to perform the join on the fact table. Some
- of these algorithms might be patented.
Miscellaneous Performance
-Last updated: Sat Dec 17 13:06:57 EST 2005
+Last updated: Sat Dec 17 14:03:20 EST 2005
The most recent version of this document can be viewed at
Log statements where the optimizer row estimates were dramatically
different from the number of rows actually found?
-
Allow star join optimizations
-
While our bitmap scan allows multiple indexes to be joined to get
- to heap rows, a star joins allows multiple dimension _tables_ to
- be joined to index into a larger main fact table. The join is
- usually performed by either creating a cartesian product of all
- the dimmension tables and doing a single join on that product or
- using subselects to create bitmaps of each dimmension table match
- and merge the bitmaps to perform the join on the fact table. Some
- of these algorithms might be patented.
-