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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