Query a collection group using a partitioned query

Code sample

Go

To authenticate to Firestore, set up Application Default Credentials. For more information, see Set up authentication for a local development environment.

cities := client.CollectionGroup("cities")

// Get a partioned query for the cities collection group, with a maximum
// partition count of 10
partitionedQueries, err := cities.GetPartitionedQueries(ctx, 10)
if err != nil {
	return fmt.Errorf("GetPartitionedQueries: %w", err)
}

fmt.Printf("Collection Group query partitioned to %d queries\n", len(partitionedQueries))

// Retrieve the first query and iterate over the documents contained.
query := partitionedQueries[0]
iter := query.Documents(ctx)
for {
	doc, err := iter.Next()
	if err == iterator.Done {
		break
	}
	if err != nil {
		return fmt.Errorf("documents iterator: %w", err)
	}
	fmt.Println(doc.Data())
}

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