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execution: initialize next in aggregation even if we aggregate the labels away #504

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4 changes: 4 additions & 0 deletions execution/aggregate/hashaggregate.go
Original file line number Diff line number Diff line change
Expand Up @@ -220,6 +220,10 @@ func (a *aggregate) initializeTables(ctx context.Context) error {
}

func (a *aggregate) initializeVectorizedTables(ctx context.Context) ([]aggregateTable, []labels.Labels, error) {
// perform initialization of the underlying operator even if we are aggregating the labels away
if _, err := a.next.Series(ctx); err != nil {
return nil, nil, err
}
tables, err := newVectorizedTables(a.stepsBatch, a.aggregation)
if errors.Is(err, parse.ErrNotSupportedExpr) {
return a.initializeScalarTables(ctx)
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