add test for large mean aggregations #2390
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neonstalwart
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@neonstalwart this is a smart change. i think this was how means were getting calculated in v0.8.x, but it was rewritten for the new query engine architecture. |
| @@ -211,29 +211,31 @@ func MapMean(itr Iterator) interface{} { | |||
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| for _, k, v := itr.Next(); k != 0; _, k, v = itr.Next() { | |||
| out.Count++ | |||
| out.Sum += v.(float64) | |||
| out.Mean += (v.(float64) - out.Mean) / float64(out.Count) | |||
| } | |||
| return out | |||
| } | |||
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| type meanMapOutput struct { | |||
| Count int | |||
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@toddboom i had a question about this... should Count be a float64? everywhere it gets used (except for where it's calculated) it gets cast to float64 and i don't know go well enough to know what is more idiomatic.
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I think leaving count as an integer makes sense to me. I don't think the cast is particularly expensive, so I'd leave it that way for now unless you feel strongly otherwise.
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i don't have a strong feeling - only uncertainty - so i'll leave it as is 😃
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+1 |
toddboom
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add test for large mean aggregations
pauldix
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Apr 24, 2015
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related to #2346
this adds a test for calculating mean values where the sum of the values causes an overflow. fix to be pushed to this branch once the tests are confirmed to cause a failure