I'm running a DynamoDBScanExpression and a few operations always fail (although they do work when I use DynamoDB on AWS) ``` ComparisonOperator.NE ComparisonOperator.NOT_CONTAINS ComparisonOperator.NULL ComparisonOperator.NOT_NULL ``` I have one test that express this problem https://github.com/velo/querydsl/blob/dynamo/querydsl-dynamodb/src/test/java/com/mysema/query/dynamodb/DynamoDBQueryTest.java