DynamoDB scan and DynamoDB.DocumentClient scan return different results

[zachary-D]

Confirm by changing [ ] to [x] below to ensure that it's a bug:

• I've gone through Developer Guide and API reference
• I've checked AWS Forums and StackOverflow for answers
• I've searched for previous similar issues and didn't find any solution

Describe the bug
Scans with DynamoDB.DocumentClient don't return any values, while scans with identical parameters on DynamoDB return the proper items.

Is the issue in the browser/Node.js?
Node.js

If on Node.js, are you running this on AWS Lambda?
Yes

Details of the browser/Node.js version
serverless framework / AWS lambda, nodejs12.x runtime

SDK version number
v2.689.0

To Reproduce (observed behavior)

const dbDoc = new DynamoDB.DocumentClient({apiVersion: "2012-08-10"});
const db = new DynamoDB({apiVersion: "2012-08-10"});

const filter: DynamoDB.DocumentClient.ScanInput = {
    TableName: "locations-table-here",
    FilterExpression: `LHash = :hash`,
    ExpressionAttributeValues: {
        ":hash": {"S": escapeSpecialCharactersForDynamoDB(hash)}
    }
};

console.log(await dbDoc.scan(filter).promise());
console.log(await db.scan(filter).promise());

Expected behavior
Both scans should return the same items, with the different formatting intended for each. As shown in the screenshot, the doc-scan returns no items.

Screenshots
If applicable, add screenshots to help explain your problem.

Additional context
Similar to #1187, if not the same issue

[ajredniwja]

Hey @zachary-D, thank-you for reaching out to us with your issue, is there an actual test case that you can provide me?

I scanned a table with around 11000 items and got the same result for the both.

[zachary-D]

I should be able to, what exactly do you need from me?

[ajredniwja]

Is it possible for you to create a sample repo to get the same results?

[RossWilliams]

Your expression attribute values for document client should be a different shape, since document client handles marshalling and un-marshalling for you. You are filtering on a map rather than a string, and not getting any results.

When using the document client change ':hash' value to a string, rather than the object you currently have.

[zachary-D]

I'll give that a try, thanks!

[github-actions]

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