title: Liquibase not executing changeset on H2 DB when precondition exists (tableexists)
body: <p>In first change set table  tb_transformation is already created. Below is the 4th changeset where i insert extra column to table when precondition passes. But its not executing the changeset. When i remove precondition and execute its inserting successfully.</p>
  
  <pre><code>&lt;changeSet id="2020-03-004-add-columns-to-tb_transformation" author="TAAS"&gt;
      &lt;preConditions onFail="CONTINUE"&gt;
              &lt;tableExists tableName="TB_TRANSFORMATION"/&gt;
      &lt;/preConditions&gt;
      &lt;addColumn tableName="TB_TRANSFORMATION"&gt;
          &lt;column name="MARKET_INFRASTRUCTURE" type="varchar(255)"&gt;
              &lt;constraints nullable="false"/&gt;
          &lt;/column&gt;
      &lt;/addColumn&gt;
  </code></pre>
  
  <p></p>