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andreer
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Apr 24, 2026
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| - The [ranking](../basics/ranking.html) expression used a feature which became `NaN` (Not a Number). For example, `log(0)` would produce | ||
| -Infinity. One can use [isNan](../reference/ranking/ranking-expressions.html#isnan-x) to guard against this. | ||
| - Surfacing low scoring hits using [grouping](../querying/grouping.html), that is, rendering low ranking hits with `each(output(summary()))` that are outside what Vespa computed and caches on a heap. This is controlled by the [total-keep-rank-count](../reference/schemas/schemas.html#total-keep-rank-count) parameter. |
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I don't understand how this is related - is this supposed to be a separate FAQ entry that is being removed?
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I was puzzled, too ... let's find out in next pr
andreer
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Apr 24, 2026
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