association tag notNullColumn attribute points error

[YangAoLib]

MyBatis version

3.5.10

Database vendor and version

MySQL 8.0.27

Test case or example project

<association property="merchant"
             notNullColumn="merchant_id"
             columnPrefix="mm_"
             resultMap="isoft.merchant.mapper.MerchantManagementMapper.MerchantResult"/>

Steps to reproduce

run this code

Expected result

notNullColumn points to column names that are not affected by columnPrefix.

notNullColumn points to merchant_id.

Actual result

notNullColumn points to MM_merchant_id.

notNullColumn affected by columnPrefix`.

[harawata]

Hello @YangAoLib ,

There is a test covering that usage and the test is passing, so I need you to create a complete test case or small repro project like these.
Please try to keep it as simple as possible (i.e. minimum number of tables, columns, classes, etc.).

Thank you!