Madhan Neethiraj created RANGER-4571:
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Summary: update handling of expressions that return null
Key: RANGER-4571
URL: https://issues.apache.org/jira/browse/RANGER-4571
Project: Ranger
Issue Type: Improvement
Components: plugins
Reporter: Madhan Neethiraj
Assignee: Madhan Neethiraj
Expressions used in policy-conditions/row-filters might evaluate to null value
i.e., like when the attribute referenced doesn't exist. In such cases, the
evaluator returns string 'null'. Instead, an empty string would be a better
return value in such case. This would also enable use of variables in
sub-expressions, like:
{code:java}
${{var d = USER.deptCode;}} dept == ${{d}}
{code}
With the current implementation, following value is returned for above
expression, assuming USER.deptCode is 10:
{code:java}
null dept == 10
{code}
This is caused by the first expression, {{{}${\{var d = USER.deptCode}}{}}},
returning {{{}null{}}}.
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