I’m currently trying to get our existing liquibase changesets working with the head of the liquibase trunk. We have some existing changesets that insert the string “NULL” as a value (i.e. not setting the column to , but inserting the string “NULL”). We also have other changesets that insert an empty string as a value. Prior to revision 1678 (http://liquibase.jira.com/source/changelog/CORE/?name=otaranenko&cs=1678), trying to insert an empty string would result in a value, which is not what we wanted; post-1678, we can insert an empty string, but now inserting the string “NULL” results in a value, which is also not what we want. How do I now insert the string “NULL” as a value?