Hi! KNN GiST detects which type it should return by returning type of ordering operator. But it appears that type of sk_func is detected after it was replaced with distance function. That is wrong: distance function should always return float8. I think it is just a typo. Should be backpatched to 9.5.
------ Alexander Korotkov Postgres Professional: http://www.postgrespro.com The Russian Postgres Company
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