HHH-16512 test for is null query on OneToOne relation #9546
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HHH-16512 describes a problem when querying OneToOne relations the "wrong" way around, because an inner join was used in combination with a "is null" query. This seems to be fixed in the current main branch, but nevertheless, this test should be included to prevent any regressions and have a reference to where the issue was officially fixed.
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https://hibernate.atlassian.net/browse/HHH-16512