get current logged in user to be used as parameter in a report

How do I  get current logged in user to be used as parameter in a report so I can implement row level security on dataset?
eluceroAsked:
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Raghavendra HullurSoftware DeveloperCommented:
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Russ SuterCommented:
CURRENT_USER will give you the name of the user in the current security context.
https://docs.microsoft.com/en-us/sql/t-sql/functions/current-user-transact-sql?view=sql-server-2017

SYSTEM_USER will give you the current login name.
https://docs.microsoft.com/en-us/sql/t-sql/functions/system-user-transact-sql?view=sql-server-2017

Depending on what permissions the login has and what he/she is doing at that moment, the two may return different values. SYSTEM_USER is the more consistent method of determining who has logged in.
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