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[SPARK-21957][SQL][FOLLOWUP] Support CURRENT_USER without tailing par…
…entheses ### What changes were proposed in this pull request? A followup for 345d35e, in this PR we support CURRENT_USER without tailing parentheses in default mode. And for ANSI mode, we can only use CURRENT_USER without tailing parentheses because it is a reserved keyword that cannot be used as a function name ### Why are the changes needed? 1. make it the same as current_date/current_timestamp 2. better ANSI compliance ### Does this PR introduce _any_ user-facing change? no, just a followup ### How was this patch tested? new tests Closes apache#32770 from yaooqinn/SPARK-21957-F. Authored-by: Kent Yao <yao@apache.org> Signed-off-by: Wenchen Fan <wenchen@databricks.com>
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