[jira] [Updated] (ACCUMULO-871) ColumnVisibilities should do more to create normalized representations of expressions

["William Slacum (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ACCUMULO-871?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

William Slacum updated ACCUMULO-871:
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    Attachment: CVTest.java

A small test that shows how flatten() behaves depending on input.
                
> ColumnVisibilities should do more to create normalized representations of expressions
> -------------------------------------------------------------------------------------
>
>                 Key: ACCUMULO-871
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-871
>             Project: Accumulo
>          Issue Type: Improvement
>    Affects Versions: 1.5.0
>         Environment: OSX
>            Reporter: William Slacum
>            Assignee: William Slacum
>            Priority: Minor
>         Attachments: col.vis.patch, CVTest.java
>
>
> ColumnVisibilities offer a `flatten()` functionality, which attempts to normalize a given expression. So, if I had an expression, `b&a&c`, and I `flatten`'d it, I'd get back `a&b&c`. 
> Through some testing, I found that this is applied and not applied depending on how the expression is written. For instance, if I had something like `(b&a)&c`, I would get back something like `c&a&b`.
> It's not much more code to provide a correct normalized form of expressions as well do some more work to detect and eliminate expressions that boil down to `expr&expr` or `expr|expr`.
> I've attached a sample program that shows some output of what the current capability is and what I think it should output.

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