liquibase preConditions当dbms type =“mssql”，其中modifyDataType被updateSQL忽略

Question

我运行简单的changeSet只在mssql上调用alter table 像这样：

<changeSet author="Foo" id="1">
        <preConditions onFail="MARK_RAN" onSqlOutput="TEST">    
             <dbms type="mssql"/> 
        </preConditions>
        <modifyDataType tableName="SAMPLE" columnName="FOO" newDataType="nvarchar"/>            
    </changeSet>

正在发生的是在所有数据库上创建了alter，这里有什么问题？

在日志中：

DEBUG 3/14/18 3:59 PM: liquibase: main.xml: ./schema/changelog111.xml::FOO : Projects::FOO: Running Changeset:./schema/changelog111.xml::FOO : Projects::FOO
DEBUG 3/14/18 3:59 PM: liquibase: main.xml: ./schema/changelog111.xml::FOO : Projects::FOO: Reading ChangeSet: ./schema/changelog111.xml::FOO : Projects::FOO
DEBUG 3/14/18 3:59 PM: liquibase: main.xml: ./schema/changelog111.xml::FOO : Projects::FOO: Executing Statement: liquibase.statement.core.ModifyDataTypeStatement@e98770d
INFO 3/14/18 3:59 PM: liquibase: main.xml: ./schema/changelog111.xml::FOO : Projects::FOO: SAMPLE.FOO datatype was changed to nvarchar
INFO 3/14/18 3:59 PM: liquibase: main.xml: ./schema/changelog111.xml::FOO : Projects::FOO: ChangeSet ./schema/changelog111.xml::FOO : Projects::FOO ran successfully in 2ms

日志中没有任何迹象：preConditions