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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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noisersup Jul 20, 2023
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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 25, 2023
commit e02bb2ae99f1b8c6bcf79289f6c52739b66ec9fa
36 changes: 36 additions & 0 deletions integration/aggregate_documents_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -146,6 +146,42 @@ func TestAggregateGroupErrors(t *testing.T) {
Message: "Unrecognized expression '$non-existent'",
},
},
"SumEmptyExpression": {
pipeline: bson.A{
bson.D{{"$group", bson.D{
{"sum", bson.D{{"$sum", "$"}}},
}}},
},
err: &mongo.CommandError{
Code: 16872,
Name: "Location16872",
Message: "'$' by itself is not a valid FieldPath",
},
},
"SumEmptyVariable": {
pipeline: bson.A{
bson.D{{"$group", bson.D{
{"_id", bson.D{{"$sum", "$$"}}},
}}},
},
err: &mongo.CommandError{
Code: 9,
Name: "FailedToParse",
Message: "Invalid $group :: caused by :: empty variable names are not allowed",
},
},
"SumDollarVariable": {
pipeline: bson.A{
bson.D{{"$group", bson.D{
{"_id", bson.D{{"$sum", "$$$"}}},
}}},
},
err: &mongo.CommandError{
Code: 9,
Name: "FailedToParse",
Message: "Invalid $group :: caused by :: '$' starts with an invalid character for a user variable name",
},
},
"GroupRecursiveNonExistentOperator": {
pipeline: bson.A{
bson.D{{"$group", bson.D{{"_id", bson.D{{"$type", bson.D{{"$non-existent", "foo"}}}}}}}},
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2 changes: 1 addition & 1 deletion internal/handlers/common/aggregations/stages/group.go
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Expand Up @@ -308,7 +308,7 @@ func (m *groupMap) addOrAppend(groupKey any, docs ...*types.Document) {
}

// processOperatorError takes internal error related to operator evaluation and
// returns proper CommandError that can be returned by $project aggregation stage.
// returns proper CommandError that can be returned by $group aggregation stage.
//
// Command error codes:
// - ErrEmptySubProject when operator value is empty.
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