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add avg operator and integration test
Signed-off-by: sayedppqq <sayedmmnn0@gmail.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,126 @@ | ||
| package accumulators | ||
|
|
||
| import ( | ||
| "errors" | ||
|
|
||
| "github.com/FerretDB/FerretDB/internal/handler/common/aggregations" | ||
| "github.com/FerretDB/FerretDB/internal/handler/common/aggregations/operators" | ||
| "github.com/FerretDB/FerretDB/internal/handler/handlererrors" | ||
| "github.com/FerretDB/FerretDB/internal/types" | ||
| "github.com/FerretDB/FerretDB/internal/util/iterator" | ||
| "github.com/FerretDB/FerretDB/internal/util/lazyerrors" | ||
| ) | ||
|
|
||
| // avg represents $avg aggregation operator. | ||
| type avg struct { | ||
| expression *aggregations.Expression | ||
| operator operators.Operator | ||
| number any | ||
| } | ||
|
|
||
| // newAvg creates a new $avg aggregation operator. | ||
| func newAvg(args ...any) (Accumulator, error) { | ||
| accumulator := new(avg) | ||
|
|
||
| if len(args) != 1 { | ||
| return nil, handlererrors.NewCommandErrorMsgWithArgument( | ||
| handlererrors.ErrStageGroupUnaryOperator, | ||
| "The $avg accumulator is a unary operator", | ||
| "$avg (accumulator)", | ||
| ) | ||
| } | ||
|
|
||
| for _, arg := range args { | ||
| switch arg := arg.(type) { | ||
| case *types.Document: | ||
| if !operators.IsOperator(arg) { | ||
| accumulator.number = int32(0) | ||
| break | ||
| } | ||
|
|
||
| op, err := operators.NewOperator(arg) | ||
| if err != nil { | ||
| var opErr operators.OperatorError | ||
| if !errors.As(err, &opErr) { | ||
| return nil, lazyerrors.Error(err) | ||
| } | ||
|
|
||
| return nil, opErr | ||
| } | ||
|
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| accumulator.operator = op | ||
| case float64: | ||
| accumulator.number = arg | ||
| case string: | ||
| var err error | ||
| if accumulator.expression, err = aggregations.NewExpression(arg, nil); err != nil { | ||
| // $avg returns 0 on non-existent field. | ||
| accumulator.number = int32(0) | ||
| } | ||
| case int32, int64: | ||
| accumulator.number = arg | ||
| default: | ||
| accumulator.number = int32(0) | ||
| // $avg returns 0 on non-numeric field | ||
| } | ||
| } | ||
|
|
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| return accumulator, nil | ||
| } | ||
|
|
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| // Accumulate implements Accumulator interface. | ||
| func (s *avg) Accumulate(iter types.DocumentsIterator) (any, error) { | ||
| var numbers []any | ||
|
|
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| for { | ||
| _, doc, err := iter.Next() | ||
|
|
||
| if errors.Is(err, iterator.ErrIteratorDone) { | ||
| break | ||
| } | ||
|
|
||
| if err != nil { | ||
| return nil, lazyerrors.Error(err) | ||
| } | ||
|
|
||
| switch { | ||
| case s.operator != nil: | ||
| v, err := s.operator.Process(doc) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
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| numbers = append(numbers, v) | ||
|
|
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| continue | ||
|
|
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| case s.expression != nil: | ||
| value, err := s.expression.Evaluate(doc) | ||
|
|
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| // avg fields that exist | ||
| if err == nil { | ||
| numbers = append(numbers, value) | ||
| } | ||
|
|
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| continue | ||
| } | ||
|
|
||
| switch number := s.number.(type) { | ||
| case float64, int32, int64: | ||
| // For number types, the result is equivalent of iterator len*number, | ||
| // with conversion handled upon overflow of int32 and int64. | ||
| // For example, { $avg: 1 } is equivalent of { $count: { } }. | ||
| numbers = append(numbers, number) | ||
| default: | ||
| // $avg returns 0 on non-existent and non-numeric field. | ||
| return int32(0), nil | ||
| } | ||
| } | ||
|
|
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| return aggregations.AvgNumbers(numbers...), nil | ||
| } | ||
|
|
||
| // check interfaces | ||
| var ( | ||
| _ Accumulator = (*avg)(nil) | ||
| ) | ||
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