keith-turner opened a new pull request, #5115:
URL: https://github.com/apache/accumulo/pull/5115

   ColumnVisibility objects have an assoiciated parse tree. Normalizing a 
column visibility would change the parse tree in place.  This would cause the 
parse tree to no longer match the expression, which would not matter for most 
operations on the parse tree.  This side effect would also cause problems for 
multiple threads attempting to normalize a column visibility.  This change 
creates a new parse tree during the normalization process and does not modify 
the existing one.


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