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7k records into Sort node, 4.5m out?

Consider this EXPLAIN ANALYZE output:


Note the Bitmap Heap Scan at the bottom claims to be producing 7094 rows, and the Sort above it expects to be processing 7330 rows (the same number the Bitmap Heap Scan expected to produce)... but the sort is actually producing 4512231 rows, which the sort time would indicate is what really happened.  How can this be?

-- Christophe Pettus

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