Thanks Mikhail, i tried changing conf but that did not help

<dataConfig>
  <dataSource type="JdbcDataSource" name="ds-1"
              driver="com.mysql.jdbc.Driver"
              url="jdbc:mysql://localhost:3306/test" 
              user="root" 
              password=""
                          session.group_concat_max_len = '70000'
                          />
                         
   <document>
   
    <entity name="parent" datasource="ds-1" pk="id"
transformer="RegexTransformer"
             query="SELECT id,name      FROM emp">
                                <field column="id" name="id" />
                                <field column="name" name="name" />
                                
                         <entity  name="child"  query="select id as 
childpk,dept from emp_details
where emp_id = '${parent.id}'">
                                                <field column="dept" 
name="dept" />
                                                <field column="childpk" 
name="childpk" />
                                 </entity>
                 
        </entity>

                  </document>
                  
        </dataConfig>




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