public String getFilterExpression() {
        return this.filterExpression;
    }
<p>
A string that contains conditions that DynamoDB applies after the <code>Scan</code> operation, but before the
data is returned to you. Items that do not satisfy the <code>FilterExpression</code> criteria are not returned.
</p>
<note>
<p>
A <code>FilterExpression</code> is applied after the items have already been read; the process of filtering does
not consume any additional read capacity units.
</p>
</note>
<p>
For more information, see <a
href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Scan.html#Scan.FilterExpression">Filter
Expressions</a> in the <i>Amazon DynamoDB Developer Guide</i>.
</p>

@return A string that contains conditions that DynamoDB applies after the <code>Scan</code> operation, but before
        the data is returned to you. Items that do not satisfy the <code>FilterExpression</code> criteria are not
        returned.</p> <note>
        <p>
        A <code>FilterExpression</code> is applied after the items have already been read; the process of
        filtering does not consume any additional read capacity units.
        </p>
        </note>
        <p>
        For more information, see <a
        href="https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Scan.html#Scan.FilterExpression"
        >Filter Expressions</a> in the <i>Amazon DynamoDB Developer Guide</i>.
aws-java-sdk-dynamodb/src/main/java/com/amazonaws/services/dynamodbv2/model/ScanRequest.java