Hi there,
I'm planning to build social network. I'm considering to use ORestricted to 
control access.
There is a hook which implements this functionality 
com.orientechnologies.orient.core.metadata.security.ORestrictedAccessHook.
ORestrictedAccessHook.onRecordBeforeRead SKIP the record if current user 
doesn't have access to this record.

I'm not really sure about how "select" is implemented internally but it 
seems like that it works as following:
Imagine I have 1000 documents and only 1 record is accessible by current 
user.
DB engine would need to select/parse all 1000 documents and "don't skip" 
only 1 out of 1000 without using any index.

Am I thinking about how it's implemented correctly? Could somebody 
elaborate on performance implication please?

Thanks,
Matus

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