An interface for transformation steps that manage loading data into a database table (or other storage system). For
example a table output step or a bulk loader. This interface is used by the Agile BI plugin to determine which steps
it can manipulate during loading of data.
Returns a human-readable message about any errors that have occurred. If any of the operations (dropTable, flush,
truncateTable) fail, this method should return a nice, accurate message describing the problem that was