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https://issues.apache.org/jira/browse/ACCUMULO-1361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13645181#comment-13645181
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Christopher Tubbs commented on ACCUMULO-1361:
---------------------------------------------
It should be noted that the VisibilityFilter handles this case. If the
visibility expression is empty, it falls back on the server-configured default
visibility "table.security.scan.visibility.default". If that is empty, then the
filter immediately returns true.
This ticket only addresses the issue where one would want to use the
VisibilityEvaluator external to Accumulo. While we can add this feature to
support that case, it's not a bug in Accumulo. It's not even something we'd use
if we did add it, because to use it, we'd have to create objects in the
iterator stack, and performance would be lower (it's must faster to check the
length of the visibility expression and default visibility than construct a
ColumnVisibility with an empty visibility, only to return true every time).
> VisibilityEvaluator throws NPE when passed a zero length byte array
> -------------------------------------------------------------------
>
> Key: ACCUMULO-1361
> URL: https://issues.apache.org/jira/browse/ACCUMULO-1361
> Project: Accumulo
> Issue Type: Bug
> Reporter: Chris McCubbin
> Assignee: Corey J. Nolet
> Priority: Minor
> Fix For: 1.6.0
>
> Attachments: ACCUMULO-1361.1.patch
>
>
> The following code snippet throws a NPE on a fairly recent version of 1.5. I
> would expect it to return true, or at the very least, to throw a meaningful
> exception.
> {code:title=SadPanda.java|borderStyle=solid}
> VisibilityEvaluator evaluator = new VisibilityEvaluator(new
> Authorizations("a".getBytes()));
> ColumnVisibility cv = new ColumnVisibility(new byte[0]);
> //The following line throws a NPE
> boolean result = evaluator.evaluate(cv);
> {code}
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