Special handling of query

The documentation says :
"When both the javax.jdo.option.IgnoreCache and kodo.FlushBeforeQueries
properties are set to false, Kodo needs to evaluate in-memory dirty
instances against the datastore values that are returned from a query.
This can sometimes result in Kodo needing to evaluate the entire extent of
objects in order to return the correct query results, which can have
drastic performance consequences."
In what case(s) is it necessary to evaluate the entire extent of objects ?
Thanks in advance.
Regards.

When any objects of any class the query touches (the candidate class or
any class reached through relation traversal) have been changed,
persisted, or deleted in the current transaction.

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