public void setPreserveNulls(Boolean preserveNulls) {
        this.preserveNulls = preserveNulls;
    }
<p>
Indicates whether NULL values are to be copied as NULL to encrypted tables (<code>TRUE</code>) or
cryptographically processed (<code>FALSE</code>).
</p>

@param preserveNulls
       Indicates whether NULL values are to be copied as NULL to encrypted tables (<code>TRUE</code>) or
       cryptographically processed (<code>FALSE</code>).
aws-java-sdk-cleanrooms/src/main/java/com/amazonaws/services/cleanrooms/model/DataEncryptionMetadata.java