vagetablechicken commented on issue #3273: fragment mem tracker doesn't be unregistered from parent URL: https://github.com/apache/incubator-doris/issues/3273#issuecomment-610819596 So, I will just add `_mem_tracker->unregister_from_parent()` in `PlanFragmentExecutor::close()`, to unregister the fragment mem tracker from exec_env_mem_tracker. And we need add recursive depth for LogUsage(), ref impala https://github.com/apache/impala/blob/d877dbc572e95f086b37142e1d41231d5b6b7f9f/be/src/runtime/mem-tracker.cc#L300 We should be careful about any access to child trackers.
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