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Comment: The user can be any user that hadoop(hdfs/yarn) supports

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User names are case sensitive. This is because, unlike role names, user names are not managed within Hive. The user can be any user that hadoop(hdfs/yarn) supports.

Quoted Identifiers

User and role names may optionally be surrounded by backtick characters (`) when the configuration parameter hive.support.quoted.identifiers is set to column (default value). All Unicode characters are permitted in the quoted identifiers, with double backticks (``) representing a backtick character. However when hive.support.quoted.identifiers is set to none, only alphanumeric and underscore characters are permitted in user names and role names.

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