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Support _id aggregation operators for $group stage #3096

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merged 19 commits into from
Jul 26, 2023
Merged

Support _id aggregation operators for $group stage #3096

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Merge branch 'main' into aggregation-group-id-operators-2964
mergify[bot] Jul 26, 2023
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@noisersup
noisersup committed Jul 21, 2023
commit 5317550709d9ae078c415593fdfaf1d7bf8c9b05
62 changes: 33 additions & 29 deletions internal/handlers/common/aggregations/stages/group.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ import (
"context"
"errors"
"fmt"
"time"

"github.com/FerretDB/FerretDB/internal/handlers/common"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations"
Expand Down Expand Up @@ -83,10 +84,12 @@ func newGroup(stage *types.Document) (aggregations.Stage, error) {

if field == "_id" {
if doc, ok := v.(*types.Document); ok {
if !operators.IsOperator(doc) {
if err = validateExpression("$group", doc); err != nil {
return nil, err
}
if operators.IsOperator(doc) {
continue
}

if err = validateExpression("$group", doc); err != nil {
return nil, err
}
}
groupKey = v
Expand Down Expand Up @@ -169,6 +172,29 @@ func (g *group) Process(ctx context.Context, iter types.DocumentsIterator, close
// groupDocuments groups documents by group expression.
func (g *group) groupDocuments(ctx context.Context, in []*types.Document) ([]groupedDocuments, error) {
switch groupKey := g.groupExpression.(type) {
case *types.Document:
if !operators.IsOperator(groupKey) {
break
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}

op, err := operators.NewOperator(groupKey)
if err != nil {
return nil, err
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}

var group groupMap

for _, doc := range in {
val, err := op.Process(doc)
if err != nil {
return nil, err
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}

group.addOrAppend(val, doc)
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}

return group.docs, nil

case string:
expression, err := aggregations.NewExpression(groupKey)
if err != nil {
Expand Down Expand Up @@ -228,39 +254,17 @@ func (g *group) groupDocuments(ctx context.Context, in []*types.Document) ([]gro
}
return group.docs, nil

case *types.Document:
if !operators.IsOperator(groupKey) {
break
}

op, err := operators.NewOperator(groupKey)
if err != nil {
return nil, err
}

var group groupMap

for _, doc := range in {
val, err := op.Process(doc)
if err != nil {
return nil, err
}

group.addOrAppend(val, doc)
}

return group.docs, nil
case *types.Array, float64, types.Binary, types.ObjectID, bool, time.Time, types.NullType, types.Regex, int32, types.Timestamp, int64:
// non-string or document key aggregates values of all `in` documents into one aggregated document.

default:
panic(fmt.Sprintf("unexpected type %[1]T (%#[1]v)", groupKey))
}

// non-string key aggregates values of all `in` documents into one aggregated document.
return []groupedDocuments{{
groupID: g.groupExpression,
documents: in,
}}, nil

//return group.docs, nil
}

// groupedDocuments contains group key and the documents for that group.
Expand Down