MyBatis association dependency on order by - mybatis

Question

I am trying to fetch data using MyBatis association. The data fetched includes list of person, each of these person have a list of companies associated with them. (see POJO) Currently, there are only two person in DB, say P1 and P0. P1 is associated with Company C1 and C2 and P0 is associated with only C1. (see sql result)
My result map contains a map for person, which itself contains an association of a map for company. (see result map)
When I am fetching the data in sql three rows are coming in the following order: (see sql result)
P1 with C1
P0 with C1
P1 with C2
When I am using "order by person, company" I am getting a correct object, i.e., List of person having two value one for P1 and other for P0, with P1 having list of C1 and C2, and P0 having list of only C1. (see JSON#1)
However, when I am not using "order by" then I am getting incorrect object list having a two objects of P1 (having list of C1 and C2). There is no object of P0. (see JSON#2)
I tried using id (as unique identifier) for company and person result map. I tried nested mapping as well.
Java side:
POJO:
public class Person {
private String personId;
private String firstName;
private String lastName;
private List<CompanyWiseDetails> companyWiseDetails;
// setters and getters
}
public class CompanyWiseDetails {
private String companyId;
private String companyName;
private String payrollCycle;
private Double januaryCatch;
// setters and getters
}
DAO:
final Map<Object, Object> paramMap = new HashMap<Object, Object>();
paramMap.put("universeEndDate", this.getUniverseEndDate());
paramMap.put("projectionDate", projectionDate);
SqlSession.selectList("fetchData")
Result Map:
<resultMap id="person" type="Person">
<id property="personId" column="person_id" />
<result property="firstName" column="first_name" />
<result property="lastName" column="last_name" />
<!-- few other fields which can be null -->
<collection
property="companyWiseDetailsList"
resultMap="companyEntityWiseDetails" />
</resultMap>
<resultMap id="companyEntityWiseDetails"
type="CompanyWiseDetails">
<id property="companyId" column="company_id" />
<result property="companyName" column="company_name" />
<result property="payrollCycle" column="payroll_cycle" />
<!-- few other fields which can be null -->
</resultMap>
SQL:
<select id="fetchData" resultMap="person" >
<include refid="toCreateTemporary_table"/>
select
table_one.person_id as person_id,
company_table.hr_company_code as company_id,
tCompany.PayrollCycle as payroll_cycle
from table_one table_one
join company_table_strategy company_table
on company_table.person_id = table_one.person_id
and company_table.as_on_date = #{projectionDate}
and company_table.tt_end= #{universeEndDate}
join tCompany
on company_table.hr_company_code = tCompany.HRCompanyCode
left join
#temporary_table
on #temporary_table.company_id = company_table.hr_company_code
and #temporary_table.person_id = table_one.person_id
where
table_one.as_on_date = #{projectionDate}
and table_one.tt_end= #{universeEndDate}
order by
person_id, entity_id
drop table #temporary_table
</select>
SQL output
person_id company_id payroll_cycle company_name cash_compensation random_percentage income comp field1 bonus field2
P1 C1 bi_weekly C1_name 5000.00000000 50.00000000 200112.10000000 60.10000000 NULL NULL NULL
P0 C1 bi_weekly C1_name 5000.00000000 50.00000000 100112.10000000 30.10000000 NULL NULL NULL
P1 C2 bi_weekly C2_name 5000.00000000 50.00000000 200112.10000000 30.10000000 362906.82000000 25000.00000000 1000.00000000
Response JSON when order by is used:
[
{
"personId": "P0",
"firstName": null,
"lastName": null,
"companyEntityWiseDetailsList": [
{
"companyId": "C1",
"companyName": null,
"payrollCycle": "bi_weekly"
}
]
},
{
"personId": "P1",
"firstName": null,
"lastName": null,
"companyEntityWiseDetailsList": [
{
"companyId": "C1",
"companyName": null,
"payrollCycle": "bi_weekly",
},
{
"companyId": "C2",
"companyName": null,
"payrollCycle": "bi_weekly",
}
]
}
]
Response JSON when order by is not used:
[
{
"personId": "P1",
"firstName": null,
"lastName": null,
"companyEntityWiseDetailsList": [
{
"companyId": "C1",
"companyName": null,
"payrollCycle": "bi_weekly",
},
{
"companyId": "C2",
"companyName": null,
"payrollCycle": "bi_weekly",
}
]
},
{
"personId": "P1",
"firstName": null,
"lastName": null,
"companyEntityWiseDetailsList": [
{
"companyId": "C1",
"companyName": null,
"payrollCycle": "bi_weekly",
},
{
"companyId": "C2",
"companyName": null,
"payrollCycle": "bi_weekly",
}
]
}
]
Should "order by" have an impact on the result