Hi Tom, Tom Raney wrote:
> We used spool functions from the BTree code to sort the index > tuples. Sorting is done on the hash value of the tuples. The hash > value depends on the number of primary bucket pages (henceforth > just bucket pages) that will be required to fit all the index > tuples. So, before sorting, the base relation is scanned to get > the total number of tuples. Just wondering, wouldn't it be enough to obtain a tuple count estimate by using reltuples / relpages * RelationGetNumberOfBlocks, like the planner does? -- Alvaro Herrera http://www.CommandPrompt.com/ The PostgreSQL Company - Command Prompt, Inc. ---------------------------(end of broadcast)--------------------------- TIP 6: explain analyze is your friend
