On 06/26/2014 11:19 AM, Claudio Freire wrote:
Try changing node_id in (...) into node.id in (...)
Wow. How did we not see that earlier? That's probably the issue. If you look at the estimates of his query:
Bitmap Heap Scan on alf_node_properties prop (cost=1253.19..189491.87 rows=52790 width=179) (actual time=0.571..1.349 rows=1071 loops=1)
The planner is off by an order of magnitude, and since the matches are against node_id instead of node.id, it thinks it would have to index seek on the alf_node table for over 50k rows. I could easily see it opting for a sequence scan in that case, depending on how high random_page_cost is.
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