How do I know that Association is internally implemented by inner join or outer association

How do I know that Association is internally implemented by inner join or outer association

I have used the following syntax to directly return the corresponding description via path expression.

The data source comes from 1: N association.

The question is: how SAP internally implements this association? Via Inner join or outer join?
Two approaches to find answer by yourself:
Approach1:

Approach2:
ST05: Display execution plan

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