title: How to add condition to changeSet
body: <p>I created database ChangeLog for liquibase and I have "CREATE TABLE" query.
  I want to add condition to column "STATUS". </p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;databaseChangeLog
          xmlns="http://www.liquibase.org/xml/ns/dbchangelog"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://www.liquibase.org/xml/ns/dbchangelog
           http://www.liquibase.org/xml/ns/dbchangelog/dbchangelog-3.5.xsd"&gt;
  
  
      &lt;changeSet id="1" author="xxx"&gt;
          &lt;comment&gt;Create Asset table&lt;/comment&gt;
          &lt;sql&gt;
              CREATE TABLE `TASK`(
              `TASK_ID` bigint(20) NOT NULL,
              `STATUS` VARCHAR(10), //(where status not equal to "pending")
              `FILE_ID` varchar(100),
              PRIMARY KEY (`DOC_ID`)
              )ENGINE=InnoDB DEFAULT CHARSET=utf8;
          &lt;/sql&gt;
      &lt;/changeSet&gt;
  &lt;/databaseChangeLog&gt;
  </code></pre>