The currently used version of liquibase has a few bugs. One of them is when changing a column name, the new name is incorrectly escaped and results in the new name being surrounded by brackets in mssql databases.
<renameColumn tableName="hl7_in_queue" oldColumnName="state" newColumnName="message_state" columnDataType="int"/>
results in a column named "[message_state]" not "message_state" as expected.
Possibly better support for modifying column data types that have default values and/or constraints for mssql databases.