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Implement
$sum aggregation standard operator (#3063)
Closes #2680.
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| // Copyright 2021 FerretDB Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
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| package aggregations | ||
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| import ( | ||
| "math" | ||
| "math/big" | ||
| ) | ||
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| // SumNumbers accumulate numbers and returns the result of summation. | ||
| // The result has the same type as the input, except when the result | ||
| // cannot be presented accurately. Then int32 is converted to int64, | ||
| // and int64 is converted to float64. It ignores non-number values. | ||
| // For empty `vs`, it returns int32(0). | ||
| // This should only be used for aggregation, aggregation does not return | ||
| // error on overflow. | ||
| func SumNumbers(vs ...any) any { | ||
| // use big.Int to accumulate values larger than math.MaxInt64. | ||
| intSum := big.NewInt(0) | ||
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| // TODO: handle accumulation of doubles close to max precision. | ||
| // https://github.com/FerretDB/FerretDB/issues/2300 | ||
| var floatSum float64 | ||
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| var hasFloat64, hasInt64 bool | ||
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| for _, v := range vs { | ||
| switch v := v.(type) { | ||
| case float64: | ||
| hasFloat64 = true | ||
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| floatSum = floatSum + v | ||
| case int32: | ||
| intSum.Add(intSum, big.NewInt(int64(v))) | ||
| case int64: | ||
| hasInt64 = true | ||
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| intSum.Add(intSum, big.NewInt(v)) | ||
| default: | ||
| // ignore non-number | ||
| } | ||
| } | ||
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| if hasFloat64 || !intSum.IsInt64() { | ||
| // ignore accuracy because there is no rounding from int64. | ||
| intAsFloat, _ := new(big.Float).SetInt(intSum).Float64() | ||
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| return intAsFloat + floatSum | ||
| } | ||
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| integer := intSum.Int64() | ||
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| if !hasInt64 && integer <= math.MaxInt32 && integer >= math.MinInt32 { | ||
| // convert to int32 if input has no int64 and can be represented in int32. | ||
| return int32(integer) | ||
| } | ||
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| return integer | ||
| } |
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