[GENERAL] explain analyze output: 0 rows, 1M loopa

So some of my output from an explain analyze here has a line that says this:

ex Scan using warranty_order_item_warranty_order_id_idx on
warranty_order_item woi_1 (cost=0.57..277.53 rows=6 width=137) (actual
time=0.110..0.111 rows=0 loops=1,010,844)

How can you have 1M loops over 0 rows?

Running on PostgreSQL 9.5.6.

-- 
To understand recursion, one must first understand recursion.


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