Go（AWS SDK v2）中的 DynamoDB Query

package main

import (
	"context"
	"fmt"
	"log"

	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/config"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)

func main() {
	ctx := context.TODO()
	cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion("us-east-1"))
	if err != nil {
		log.Fatalf("load config: %v", err)
	}
	client := dynamodb.NewFromConfig(cfg)

	paginator := dynamodb.NewQueryPaginator(client, &dynamodb.QueryInput{
		TableName: aws.String("Music"),
		KeyConditionExpression: aws.String(
			"#hashKey = :hashKeyValue AND begins_with(#rangeKey, :rangeKeyValue)"),
		ExpressionAttributeNames: map[string]string{
			"#hashKey":  "Artist",
			"#rangeKey": "SongTitle",
		},
		ExpressionAttributeValues: map[string]types.AttributeValue{
			":hashKeyValue":  &types.AttributeValueMemberS{Value: "Arturo Sandoval"},
			":rangeKeyValue": &types.AttributeValueMemberS{Value: "C"},
		},
	})

	var items []map[string]types.AttributeValue
	for paginator.HasMorePages() {
		page, err := paginator.NextPage(ctx)
		if err != nil {
			log.Fatalf("query: %v", err)
		}
		items = append(items, page.Items...)
	}
	fmt.Printf("Found %d items\n", len(items))
}