Scara Maccai wrote:
I'm still looking into it, but it seems the difference in the 2 plans is due to the fact that when using partitions, the planner adds the time it would take to index-scan the empty "root" table. But that table will never contain any data...Is there any chance to have the partitioning mechanism know that a table will always contain no data, because only inheriting table will contain data? Having the planner line: -> Index Scan using teststscell13_pkey on teststscell13 data1 (cost=0.0..3.9 rows=1 width=16) (actual time=0.006..0.006 rows=0 loops=285) doesn't make any sense: that table will never have any data. I'd like to have a way to tell that to Postgresql...
It's one index probe and takes virtually no time at all. That's not your problem.
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