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Support recursive operator calls for $sum aggregation accumulator #3116

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merged 18 commits into from
Jul 31, 2023
Merged

Support recursive operator calls for $sum aggregation accumulator #3116

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Merge branch 'main' into aggregation-recursive-sum-2964
mergify[bot] Jul 31, 2023
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@noisersup
noisersup committed Jul 26, 2023
commit 53c96f9d996c9af5de67b52872f3693087b154ba
17 changes: 16 additions & 1 deletion internal/handlers/common/aggregations/operators/accumulators/sum.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ import (
"errors"

"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations/operators"
"github.com/FerretDB/FerretDB/internal/handlers/commonerrors"
"github.com/FerretDB/FerretDB/internal/types"
"github.com/FerretDB/FerretDB/internal/util/iterator"
Expand All @@ -44,7 +45,21 @@ func newSum(accumulation *types.Document) (Accumulator, error) {
"$sum (accumulator)",
)
case *types.Document:
accumulator.number = int32(0)
if !operators.IsOperator(expr) {
//TODO
accumulator.number = int32(0)
}

_, err := operators.NewOperator(expr)

if err != nil {
var opErr operators.OperatorError
if !errors.As(err, &opErr) {
return nil, lazyerrors.Error(err)
}

return nil, opErr
}

case float64:
accumulator.number = expr
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9 changes: 8 additions & 1 deletion internal/handlers/common/aggregations/operators/operators.go
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Expand Up @@ -71,6 +71,7 @@ func IsOperator(doc *types.Document) bool {

// NewOperator returns operator from provided document.
// The document should look like: `{<$operator>: <operator-value>}`.
// It also validates the document.
//
// Before calling NewOperator on document it's recommended to validate
// document before by using IsOperator on it.
Expand All @@ -95,7 +96,13 @@ func NewOperator(doc *types.Document) (Operator, error) {

switch {
case supported:
return newOperator(doc)
op, err := newOperator(doc)
if err == nil {
_, err = op.Process(nil)
}

return op, err

case unsupported:
return nil, newOperatorError(
ErrNotImplemented,
Expand Down