ddb-parallel-scan.js

const {parallelScan} = require('@shelf/dynamodb-parallel-scan');

(async () => {
  const items = await parallelScan(
    {
      TableName: 'files',
      FilterExpression: 'attribute_exists(#fileSize)',
      ExpressionAttributeNames: {
        '#fileSize': 'fileSize',
      },
      ProjectionExpression: 'fileSize',
    },
    {concurrency: 1000}
  );

  console.log(items);
})();