Csaba Ringhofer resolved IMPALA-9242.
    Resolution: Implemented

> Access check should only check against the privileges of the authorizable
> -------------------------------------------------------------------------
>                 Key: IMPALA-9242
>                 URL: https://issues.apache.org/jira/browse/IMPALA-9242
>             Project: IMPALA
>          Issue Type: Improvement
>            Reporter: Vihang Karajgaonkar
>            Assignee: Csaba Ringhofer
>            Priority: Major
> Currently, according to the implementation of 
> https://github.com/apache/sentry/blob/branch-2.1.0/sentry-provider/sentry-provider-cache/src/main/java/org/apache/sentry/provider/cache/SimpleCacheProviderBackend.java#L64
> each access check request in Sentry is done against all the privileges of the 
> user. Instead, we can reduce the number of privilege checks significantly, if 
> we use this API in 
> https://github.com/apache/sentry/blob/master/sentry-provider/sentry-provider-cache/src/main/java/org/apache/sentry/provider/cache/PrivilegeCache.java#L46
> Unfortunately, SENTRY-1291 which is merged in master branch of Sentry is 
> unavailable. However, if we can have a interface side changes in 
> PrivilegeCache, Impala can implement a prefix-tree based {{PrivilegeCache}} 
> so that number of privileges returned are only related to the given 
> authorizable. This API can then be used in SimpleCacheProviderBackend to 
> reduce the processing time required to check access for a large number of 
> objects in large setups.

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