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Sentry Column Level Security is Access Control is an improvement which  support column level access control, this means sentry support make Sentry supports privileges granularity up to a column now. The column level privileges are a fairly standard functionality supported by most RDBMS vendors. This facilitate users to restrict access to sensitive data. In absence of column level privileges, one has to create views with subset of columns and grant privileges on views. This add a major administrative overhead. 

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