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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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implement helper
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@noisersup
noisersup committed Jul 24, 2023
commit 8a49af4a9672e84a16b701c22753fec281b4a816
95 changes: 93 additions & 2 deletions internal/handlers/common/aggregations/stages/group.go
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Original file line number Diff line number Diff line change
Expand Up @@ -176,15 +176,15 @@ func (g *group) groupDocuments(ctx context.Context, in []*types.Document) ([]gro
case *types.Document:
op, err := operators.NewOperator(groupKey)
if err != nil {
return nil, err
return nil, processOperatorError(err)
}

var group groupMap

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

group.addOrAppend(val, doc)
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Expand Down Expand Up @@ -297,6 +297,97 @@ 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.
//
// Command error codes:
// - ErrEmptySubProject when operator value is empty.
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// - ErrFieldPathInvalidName when FieldPath is invalid.
// - ErrNotImplemented when the operator or expression is not implemented yet.
// - ErrOperatorWrongLenOfArgs when the operator has an invalid number of arguments.
// - ErrInvalidPipelineOperator when the operator does not exist.
// - ErrFailedToParse when operator has invalid variable expression.
// - ErrGroupInvalidFieldPath when operator has empty path expression.
func processOperatorError(err error) error {
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if err == nil {
return nil
}
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var opErr operators.OperatorError
var exErr *aggregations.ExpressionError

switch {
case errors.As(err, &opErr):
switch opErr.Code() {
case operators.ErrTooManyFields:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrFieldPathInvalidName,
"Invalid $group :: caused by :: FieldPath field names may not start with '$'."+
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" Consider using $getField or $setField.",
"$group (stage)",
)
case operators.ErrNotImplemented:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrNotImplemented,
"Invalid $group :: caused by :: "+opErr.Error(),
"$group (stage)",
)
case operators.ErrArgsInvalidLen:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrOperatorWrongLenOfArgs,
"Invalid $group :: caused by :: "+opErr.Error(),
"$group (stage)",
)
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case operators.ErrInvalidExpression:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrAggregateInvalidExpression,
"Invalid $group :: caused by :: "+opErr.Error(),
"$group (stage)",
)
case operators.ErrInvalidNestedExpression:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrInvalidPipelineOperator,
"Invalid $group :: caused by :: "+opErr.Error(),
"$group (stage)",
)
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}

case errors.As(err, &exErr):
switch exErr.Code() {
case aggregations.ErrNotExpression:
// handled by upstream and this should not be reachable for existing expression implementation
fallthrough
case aggregations.ErrInvalidExpression:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrFailedToParse,
"Invalid $group :: caused by :: '$' starts with an invalid character for a user variable name",
"$group (stage)",
)
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case aggregations.ErrEmptyFieldPath:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrGroupInvalidFieldPath,
"Invalid $group :: caused by :: '$' by itself is not a valid FieldPath",
"$group (stage)",
)
case aggregations.ErrUndefinedVariable:
// TODO https://github.com/FerretDB/FerretDB/issues/2275
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrNotImplemented,
"Aggregation expression variables are not implemented yet",
"$group (stage)",
)
case aggregations.ErrEmptyVariable:
return commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrFailedToParse,
"Invalid $group :: caused by :: empty variable names are not allowed",
"$group (stage)",
)
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}
}

return lazyerrors.Error(err)
}

// check interfaces
var (
_ aggregations.Stage = (*group)(nil)
Expand Down